Một loài thực vật có bộ nhiễm sắc thể lưỡng bội 2n. Cây tam bội được phát sinh từ loài này có bộ nhiễm sắc thể là




A.4n
B.2n + 1
C.2n-1.
D.3n

Dãy các chất vừa có tính oxi hoá vừa có tính khử là




A.S, FeO, Fe2O3
B.S, SO2, SO3
C.FeO, S, SO2
D.FeO, MgO, SO2

Exercise 5. Complete the sentences with the words below.worldwide           restore                 photosynthesisalternative          encourage           establish              clear
Câu 1: You can take the bus as a(n)                    to driving a car.
Câu 2: Global warming has accelerated  and had a negative effect                 .
Câu 3: Consumers have been                   to use environmentally friendly products.
Câu 4:                    is a process by which green plants and other organisms turn carbon dioxide and water into carbohydrates and oxygen, using light energy.
Câu 5: To                means to set up or initiate.
Câu 6: The trees in this area were                    off for crops and the construction of public facilities.
Câu 7: The trees in this area were                    off for crops and the construction of public facilities.

A.
B.
C.
D.

Exercise 4. Change the following sentences in direct speech to reported speech.During a group discussion on environmental threats,...
Câu 1: Nam said (that), "The environment is severely affected by pollution."
Câu 2: Mai said (that), "The burning of fossil fuels leads to air pollution."
Câu 3: Peter said (that), "Intensive insecticide and pesticide sprays in agriculture make the soil contaminated."
Câu 4: Tony said (that), "The disposal of untreated sewage in rivers and oceans leads to water pollution."
Câu 5: Mary said (that), "Loud and annoying sounds from innumerable vehicles in the highway nearby cause noise pollution."
Câu 6: Mai said (that), "The rising sea level is a product of global warming, a natural phenomenon. The only unnatural thing about global warming is the accelerated rate at which it is happening."
Câu 7: Linda said (that), "Environmental pollution is an impact of human activities on the environment."

A.
B.
C.
D.

Exercise 3. Make nouns from the verbs by adding the correct suffix -tion, -sion, or -ation. Make changes in the word form, if necessary.
Câu 1: erode ->..........................                        
Câu 2: consume -> …………………
Câu 3: deplete  -> ..................                     
Câu 4: destroy ->……………………..
Câu 5: contaminate ->....................                                      
Câu 6: deforest ->.......................
Câu 7: protect -> …………….
Câu 8: pollute -> ………………….

A.
B.
C.
D.

Exercise 2. Use the following words to complete the sentencespeople              environment             plants             pollution        preservation           depletion            animals          impact
Câu 1: The             of the ozone layer is not a good thing for the Earth.
Câu 2: We need to protect the                   for the next generation.
Câu 3: Deforestation will lead to the extinction of rare                  due to the loss of their habitats, and extreme floods and land erosion.
Câu 4: Worldwide rainforest                            has been the aim of many environmentalists.
Câu 5:                      should make efforts to preserve the environment for the sake of themselves and their children.
Câu 6: Environmental                      is one of the greatest and most urgent problems in modern times.
Câu 7: Many countries have signed up to international agreements which aim to reduce the negative                     of climate change.
Câu 8: Any amateur gardener knows                     need two things to survive: sunlight and water.

A.
B.
C.
D.

Exercise 8. Write a paragraph about a boy who learnt how to make delicious cakes and bread from the Internet, using the cues below.
Câu 1: My classmate Hiep / special boy / can make / nice-looking / delicious cakes / bread /.
Câu 2: He / tell / us / his interest / bakery / begin / he / be / only 10 / old /.
Câu 3: One day / he / see / beautiful images /cakes / bread / Internet / become curious /.
Câu 4: This curiosity / motivate / look for / online recipes / make / cakes / bread /.
Câu 5: Hiep / download / recipes / follow / instructions /carefully / several months later / become / well-known / at school / as / good baker /.
Câu 6: Last summer / he / work / café / bake / cakes / give / lessons / bakery / girls /.

A.
B.
C.
D.

Exercise 5. Read the text and fill each gap with a word or phrase from the box.a.Internet               b. 'digital natives'              c. computers            d. apps                   e. devicesMobile technology can help students open the door to new horizons, making their learning flexible, motivating and speedy. It is not difficult to understand why more and more schools are encouraging mobile learning in the classroom. Smartphones, tablet (1)                     , e-readers, netbooks and laptops, etc. are gradually becoming great learning tools for students.Mobile devices make learning flexible. School computer labs with desktops are wonderful but they are not handy. Students cannot use them in the school yard during the break time or in the school canteen while they wait for lunch. Mobile learning (2)       aredifferent. They are light, portable and convenient. Students can carry these devices with them wherever they want and whenever they like.Mobile learning is motivating. Students are more excited and inspired to study when they work with different types of apps. These (3)                 not only help them understand the materials better but also motivate them to study harder both in and out of the classroom. Motivation and inspiration can lead to good results, and good results can lead to more motivation and inspiration.Mobile learning makes education speedy. Without having to leave the school building, students can instantly get information or materials necessary for their study. This can be done easily thanks to mobile devices with WiFi. The (4)                   brings the whole world into the classroom and it takes students just a few seconds to access this wonderful world of knowledge and information. Mobile technology is already here. It is up to each school to choose the time when they allow the use of mobile devices and the extent to which their (5)           can take full advantage of these devices. Hopefully,they can make the right decision quickly to help broaden students' learning opportunities both inside and outside of class.
Câu 1: (1)
Câu 2: (2) 
Câu 3: (3) 
Câu 4: (4)
Câu 5: (5) 

A.
B.
C.
D.

Exercise 4. Finish the incomplete sentences, using which, that, who or whose.
Câu 1: Quang answered the phone. He told me you were out.
Quang........................................................................            
Câu 2: A computer technician served us. He was very nice.
A computer technician................................................................... 
Câu 3: The article is about smartphones. They have become excellent study tools.
The article is.................................................................................. 
Câu 4: This tablet is mine. Its screen has been scratched.
This tablet...................................................................................... 
Câu 5: Do you know the name of the man? His laptop was broken.
Do you............................................................................................ 
Câu 6: An e-book is an electronic book. It can be read on a mobile device.
An e-book is.................................................................................. 

A.
B.
C.
D.

Exercise 3.  Match 1-6 with a - f to make meaningful sentences.1. My classmate,2. Small children3. I don't like stories or films4. The men work for a company5. The girl6. Alexander Graham Bell, a. that have unhappy endings.b. who invented the telephone, was born in Scotland.c. whose injury is serious has been taken to hospital.d. who have special needs can take advantage of this new application.e. who didn't use a dictionary, translated this story.f. that makes good laptops and tablets.
Câu 1:
Câu 2:
Câu 3:
Câu 4:
Câu 5:
Câu 6:

A.
B.
C.
D.