Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid removes minerals from tooth enamel, allowing tooth decay to begin; the saliva in your mouth encourages remineralization and neutralizes the acid. The rate at which bacteria in the mouth produce acid depends on the amount of plaque on the teeth, the composition of the microbial flora, and whether the bacteria of the plaque have been "primed" by frequent exposure to sugar. To keep your teeth healthy, a regular dental hygiene program should be followed.Removing plaque with a toothbrush and dental floss temporarily reduces the numbers of bacteria in the mouth and thus reduces tooth decay. It also makes the surfaces of the teeth more accessible, enabling saliva to neutralize acid and remineralize lesions. If fluoride is present in drinking water when teeth are forming, some fluoride is incorporated into the enamel of the teeth, making them more resistant to attack by acid. Fluoride toothpaste seems to act in another way, by promoting the remineralization of early carious lesions.In addition to a regular dental hygiene program, a good way to keep your teeth healthy is to reduce your intake of sweet food. The least cavity-causing way to eat sweets is to have them with meals and not between. The number of times you eat sweets rather than the total amount determines how much harmful acid the bacteria in your saliva produce. But the amount of sweets influences the quality of your saliva. Avoid, if you can, sticky sweets that stay in your mouth a long time. Also try to brush and floss your teeth after eating sugary foods. Even rinsing your mouth with water is effective.Whenever possible, eat foods with fiber, such as raw carrot sticks, apples, celery sticks, etc., that scrape off plaque, acting as a toothbrush. Cavities can be greatly reduced if these rules are followed when eating sweets.
Câu 1: What does this passage mainly discuss?


A.  Good nutrition      


B. Food with fiber


C. ways to keep your teeth healthy


D. Fluoridization and cavities
Câu 2: The word “it” refers to                                   .


A. dental floss  


B. bacteria                   


C. removal of plaque    


D. plaque
Câu 3: According to the passage, all of the following statements about plaque 


A. It consists of acid producing bacteria


B. It is not affected by eating sweets


C.  It can be removed from teeth by brushing and flossing


D.  It reduces the positive effect of saliva
Câu 4: We can infer from the passage that one benefit of fluoride to healthy teeth is                                .


A. It strengthens tooth enamel 


B. It stimulates saliva production


C. It makes teeth whiter        


D. It is a replacement for brushing and flossing in dental care
Câu 5: What can be concluded from the passage about sweets?


A. All sweets should be avoided.


B. Sweets should be eaten with care.


C.  It is better to eat sweets a little at a time throughout the day.


D. Sticky sweets are less harmful than other sweets.
Câu 6: The author of the passage states that the amount of acid produced by the bacteria in your saliva increases             .


A. with the amount of sweets you eat 


B. with the number of times you eat sweets


C.  if you eat sweets with your meals    


D. if you eat sticky sweets
Câu 7: The word "scrape off" is closest in meaning to                                 .


A.  repel   


B.  rub together with        


C. remove    


D. dissolve 

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Các câu hỏi liên quan

Read the following passage and mark the letter A,B,C or D on your answer sheet to indicate the correct answer to each of the question.Improving girl’s educational levels has been demonstrated to have clear impacts on the health and economic future of young women, which in turn improves the prospects of their entire community. The infant mortality rate of babies whose mothers have received primary education is half that of children whose mothers are illiterate. In the poorest countries of the world, 50% of girls do not attend secondary school. Yet, research shows that every extra year of school for girls increases their lifetime income by 15%. Improving female education, and thus the earning potential of women, improves the standard of living for their own children, as women invest more of their income in their families than men do. Yet, many barriers to education for girls remain. In some African countries, such as Burkina Faso, girls are unlikely to attend school for such basic reasons as a lack of private latrine facilities for girls.Higher attendance rates of high schools and university education among women, particularly in developing countries, have helped them make inroads to professional careers with better-paying salaries and wages. Education increases a woman's (and her partner and the family's) level of health and health awareness. Furthering women's levels of education and advanced training also tends to lead to later ages of initiation of sexual activity and first intercourse, later age at first marriage, and later age at first childbirth, as well as an increased likelihood to remain single, have no children, or have no formal marriage and alternatively, have increasing levels of long-term partnerships. It can lead to higher rates of barrier and chemical contraceptive use (and a lower level of sexually transmitted infections among women and their partners and children), and can increase the level of resources available to women who divorce or are in a situation of domestic violence. It has been shown, in addition, to increase women's communication with their partners and their employers, and to improve rates of civic participation such as voting or the holding of office.
Câu 1: It is stated in the first paragraph that ______.


A. women's education levels have influence on the prospect of their community


B. women who have little schooling often have no idea of raising their children


C. it is the children's schooling that helps their mothers increase their lifetime income


D. earning their own living, women take the responsibility of running the household
Câu 2: Which of the following statements is true according to the first paragraph?


A. Many children in Asia have died because of their mother's ignorance


B. Children whose mother are illiterate are unable to grow healthily


C. The higher their education level is, the more money women earn


D. It is their husbands who make women improve their education level
Câu 3: It is implied in the first paragraph that ______.


A. the husband in a family takes little responsibility in rearing the children


B. the mother in a family makes every effort to raise the children effectively


C. the children's standard of living largely depends on their mother's income


D. there are numerous reasons for women not to come to class worldwide
Câu 4: The word "barriers" in the passage is closest in meaning to ______.


A. challenges


B. problems


C. difficulties


D. limits
Câu 5: The phrase "make inroads into" in the passage can be best replaced with ______.


A. make progress in


B. celebrate achievement in


C. succeed in taking


D. take the chance in
Câu 6: According to the passage, furthering women's levels of education and advanced training does not result in ______.


A. an increased level of health awareness for the husbands


B. an increased likelihood to remain single among women


C. higher rates of barrier and chemical contraceptive use


D. improved rates of civic participation among women
Câu 7: The word "It" in the passage refers to ______.


A. furthering women's levels of education and advanced training


B. higher attendance rates of high schools and university education


C. increasing levels of long-term partnership


D. a woman's level of health and health awareness
Câu 8: What can be the best title of the reading passage?


A. Education and Women's Empowerment


B. Female Education and Social Benefits


C. Woman's Rights to Lifelong Education


D. Education and Violence Against Women
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Read the passage and mark A, B, C or D to indicate the correct answer to each of the questions.            We find that bright children are rarely held back by mixed-ability teaching. On the contrary, both their knowledge and experience are enriched. We feel that there are many disadvantages in streaming pupils. It does not take into account the fact that children develop at different rates. It can have a bad effect on both the bright and the not-so-bright child. After all, it can be quite discouraging to be at the bottom of the top grade!            Besides, it is rather unreal to grade people just according to their intellectual ability. This is only one aspect of their total personality. We are concerned to develop the abilities of all our pupils to the full, not just their academic ability. We also value personal qualities and social skills, and we find that mixed-ability teaching contributes to all these aspects of learning.            In our classroom, we work in various ways. The pupils often work in groups; this gives them the opportunity to learn to co-operate, to share, and to develop leadership skills. They also learn how to cope with the personal problems as well as learning how to think, to make decisions, to analyze and evaluate, to communicate effectively. The pupils learn from each other as well as from the teachers.              Sometimes the pupils work in pairs; sometimes the work on individual tasks and assignments, they can do this at their own speed. They also have some formal class teaching when this is appropriate. We encourage our pupils to use the library, and we teach them the skills they need in order to do this effectively. An advanced pupil can do advanced works; it does not matter what age the child is. We expect our pupils to do their best, not their least, and we give them every encouragement to attain this goal.
Câu 1: The phrase "held back" in paragraph 1 means_________.


A. made to lag behind 


B. prevented from advancing  


C. forced to study in lower classes 


D. made to remain in the same classes
Câu 2: The author argues that a teacher’s chief concern should be the development of the pupils’ _________

     


A. intellectual abilities    


B. learning ability and communicative skills  


C.  personal and social skills     


D. total personality   
Câu 3: Which of the following is NOT mentioned in the passage?


A. Pupils also learn how to participate in teaching activities     


B. Group work gives pupils the opportunity to learn to work together with others


C.  Pupils also learn to develop their reasoning ability


D. Group work provides the pupils with the opportunity to learn to be capable organizers   
Câu 4: The author’s purpose of writing this passage is to ______.


A. offer advice on the proper use of the school library


B. argue for teaching bright and not-so-bright pupils in the same class


C. recommend pair work and group work classroom activities


D. emphasize the importance of appropriate formal classroom teaching 
Câu 5: According to the passage, which of the following is NOT true?
 


A. There is no fixed method in teaching pupils to develop themselves to the full 


B. Development of pupils as individuals is not the aim of group work


C. It’s not good for a bright child to find out that he performs worst in a mixed-ability class  


D. Pupils cannot develop in the best way if they are streamed into classes of different intellectual abilities 
Câu 6: According to the passage, which of the following is an advantage of mixed-ability teaching?
 


A. A pupil can be at the bottom of a class


B. Pupils as individuals always have the opportunities to work on their own


C. Formal class teaching is the important way to give pupils essential skills such as those to be used in the library.


D. Pupils can be hindered from an all-round development
Câu 7: According to the passage, “streaming pupils”  ______


A.  is the act of putting pupils into class according to their academic abilities


B. aims at enriching both their knowledge and experience


C. is quite discouraging


D. will help the pupils learn best
Câu 8: According to the author, mixed-ability teaching is more preferable because _______
 


A. children can learn to work with each other to solve personal problems


B. it doesn’t have disadvantages as in streaming pupils


C.  its aim at developing the children’s total personality


D. formal class teaching is appropriate
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.       Although the “lie detectors” are being used by governments, police departments, and businesses that all want guaranteed ways of detecting the truth, the results are not always accurate. Lie detectors are properly called emotion detectors, for their aim is to measure bodily changes that contradict what a person says. The polygraph machine records changes in heart rate, breathing, blood pressure, and the electrical activity of the skin (galvanic skin response, or GSR). In the first part of the polygraph test, you are electronically connected to the machine and asked a few neutral questions (“What is your name?”, “Where do you live?”). Your physical reactions serve as the standard (baseline) for evaluating what comes next. Then you are asked a few critical questions among the neutral ones (“When did you rob the bank?”). The assumption is that if you are guilty, your body will reveal the truth, even if you try to deny it. Your heart rate, respiration, and GSR will change abruptly as you respond to the incriminating questions.       That is the theory; but psychologists have found that lie detectors are simply not reliable. Since most physical changes are the same across all emotions, machines cannot tell whether you are feeling guilty, angry, nervous, thrilled, or revved up form an exciting day. Innocent people may be tense and nervous about the whole procedure. They may react physiologically to a certain word (“bank”) not because they robbed it, but because they recently bounced a check. In either case the machine will record a “lie”. The reverse mistake is also common. Some practiced liars can lie without flinching, and others learn to beat the machine by tensing muscles or thinking about an exciting experience during neutral questions.
Câu 1: What is the main idea of this passage?  


A. Lie detectors distinguish different emotions             


B. Physical reaction reveal guilty


C. Lie detectors make innocent people nervous  


D. How lie detectors are used and their reliability
Câu 2: According to the test, polygraph ________.         


A. measure a person’s thoughts 


B. always reveal the truth about a person


C. make guilty people angry    


D. record a person’s physical reactions
Câu 3: According to the passage, what kind of questions is asked on the first part of the polygraph test?


A. incriminating                      


B. critical                       


C. emotional                        


D. unimportant
Câu 4: The word “ones” in paragraph 1 refers to ______.     


A. questions                            


B. reactions                   


C. standards                         


D. evaluations
Câu 5: The word “it” in paragraph 1 refers to ______.   


A. the question    


B. your body


C.  the assumption 


D. the truth
Câu 6: The word “assumption” in paragraph 1 could best be replaced with _____.


A. belief                                  


B. faith                          


C. statement                         


D. imagining
Câu 7: This passage was probably written by a specialist in _____.


A. sociology                           


B. anthropology            


C. criminal psychology  


D. mind reading

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