Câu hỏi:

09/08/2023 2,814 Lưu

 Read the passage carefully, then choose the correct option (marked A, B, C or D) to answer the questions.

Scientists have established that influenza viruses taken from man can cause disease in animals. In addition, man can catch the disease from animals. In fact, a greater numbers of wild birds seem to carry the virus without showing any evidences of illness. Some scientists conclude that a large family of influenza virus may have evolved in the bird kingdom, a group that has been on earth 100 million years and is able to carry the virus 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 virus 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 virus?

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.

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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

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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

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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

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verified Giải bởi Vietjack

Chọn D

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Câu 5

A. Only who
B. Only those who  
C. Only who were those 
D. Only were those who

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Câu 6

A. bear out
B. make out
C. think out
D. try out

Lời giải

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