Câu hỏi:

10/08/2023 9,442 Lưu

Read the following passage and choose the correct answer to each of the questions.      

   Scientists have established that influenza viruses taken from man can cause diseases in animals. In addition, man can catch the diseases from animals. In fact, a greater number of wild birds seem to carry the viruses without showing any evidence of illness. Some scientists conclude that a large family of influenza viruses may have evolved in the bird kingdom, a group that has been on earth 100 million years and is able to carry the viruses without contracting the disease. There is even convincing evidence to show that virus strain are transmitted from place to place and from continent to continent by migrating birds.         It is known that two influenza viruses can recombine when both are present in an animal at the same time. The result of such recombination is a great variety of strains containing different H and N spikes. This raises the possibility that a human influenza viruses can recombine with an influenza virus from a lower animal to produce an entirely new spike. Research is underway to determine if that is the way major new strains come into being. Another possibility is that two animal influenza strains may recombine in a pig, for example, to produce a new strain which is transmitted to man. 

According to the passage, scientists have discovered that influenza viruses _______

A. cause ill health in wild animals 

B. do not always cause symptoms in birds

C. are rarely present in wild birds 

D. change when transmitted from animals to man 

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Trả lời:

verified Giải bởi Vietjack

Chọn B

Câu hỏi cùng đoạn

Câu 2:

What is known about the influenza viruses?

A. It was first found in a group of very old birds. 

B. All the different strains can be found in wild birds 

C. It existed over 100 million years ago.

D. It can survive in many different places. 

Xem lời giải

verified Giải bởi Vietjack

Chọn D

Câu 3:

According to the passage, a great variety of influenza strains can appear when______

A. H and N spikes are produced 

B. animal and bird viruses are combined

C. dissimilar types of viruses recombine

D. two viruses of the same type are contracted 

Xem lời giải

verified Giải bởi Vietjack

Chọn C

Câu 4:

New strains of viruses are transmitted to man by_______

A. a type of wild pig 

B. diseased lower animals 

C. a group of migrating birds 
D. a variety of means

Xem lời giải

verified Giải bởi Vietjack

Chọn D

Câu 5:

It can be inferred from the passage that all of the following are ways of producing new strains of influenza EXCEPT_______

A. two influenza viruses in the same animal recombining 

B. animal viruses recombining with human viruses

C. two animal viruses recombining 

D. two animal viruses recombining in a human 

Xem lời giải

verified Giải bởi Vietjack

Chọn D

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Câu 6

A. whenever the work is 

B. when the work 

C. is when the work 
D. whenever working

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