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kn2219
2 năm trước
The word “carcinogenic” is closest in meaning to ______.
A.trouble-making   
B.color-retaining
C.money-making   
D.cancer-causing
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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 following questions.
These stories of killer bees in the news in recent years have attracted a lot of attention as the bees have made their way from South America to North America. Killer bees are reputed to be extremely aggressive in nature, although experts say that their aggression may have been somewhat inflated. 
The killer bee is a hybrid- or combination- of the very mild European strain of honeybee and the considerably more aggressive African bee, which was created when the African strain was imported into Brazil in 1955. The African bees were brought into Brazil because their aggression was considered an advantage: they were far more productive than their European counterparts in that they spent a higher percentage of their time working and continued working longer in inclement weather than did the European bees. 
These killer bees have been known to attack humans and animals, and some fatalities have occurred. Experts point out, however, that the mixed breed known as the killer bee is actually not at all as aggressive as the pure African bee. They also point out that the attacks have a chemical cause. A killer bee stings only when it has been disturbed; it is not aggressive by nature. However, after a disturbed bee stings and flies away; it leaves its stinger embedded in the victim. In the viscera attached to the embedded stinger is the chemical isoamyl acetate, which has an odor that attracts other bees. As other bees approach the victim of the original sting, the victim tends to panic, thus disturbing other bees and causing them to sting. The new stings create more of the chemical isoamylacetate which attracts more bees and increases the panic level of the victim. Killer bees tend to travel in large clusters or swarms and thus respond in large numbers to the production of isoamyl acetate.
It can be inferred from the passage that the killer bee
A.was carried from Africa to Brazil in 1955.
B.did not exist early in the twentieth century.
C.travelled from Brazil to Africa in 1955.
D.was a predecessor of the African bee.

Exercise 4. Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits the numbered blanks. 
Some people return to college as mature students and take full- or part-time training courses in a skill will help them to get a job. The development of open learning, (16)______ it possible to study when it is convenient for the students, has increased the opportunities available (17)______ many people. This type of study was formerly restricted to book-based learning and (18)______ course but now includes courses on TV, CD-ROM or the Internet, and self-access courses at language or computer centers.
Americans believe that education is important at all stage of life and should not stop (19)______ people get their first job. About 40% of adults take part in some kind of  formal education. About half of them are trying to get qualifications and skills to help them with their jobs, the (20)______ are taking recreational subjects for personal satisfaction. Schools and community colleges arrange evening classes, and a catalog of courses is published by local boards of education.
(20) 
A.remains                   
B.rest                          
C.excess                     
D.left

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