题目内容

Question 17.

A. They like to form colonies in electrical units.
B. They can survive a long time without water.
C. They can cause damage to people's homes.
D. They are larger than many other species.

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Question 18.

A. Refrain from eating sugary food.
B. Destroy their colonies close by.
C. Keep doors and windows shut.
Deny them access to any food.

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[音频]Question 19.

A. The function of the human immune system.
B. The cause of various auto-immune diseases.
C. The change in people's immune system as they get older.
D. The viruses that may infect the human immune system.

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Question 20

A. Offer blood samples.
B. Help to interview patients.
C. Act as research assistants.
D. Report their illnesses.

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Question 21

A. Strengthening people's immunity to infection.
Better understanding patients' immune system.
C. Further reducing old patients' medical expenses.
D. Helping improve old people's health conditions.

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Question 17.

A. They like to form colonies in electrical units. B. They can survive a long time without water. C. They can cause damage to people's homes. D. They are larger than many other species.

Question 18.

[音频]Question 19.

Question 20

Question 21

A. They like to form colonies in electrical units.
B. They can survive a long time without water.
C. They can cause damage to people's homes.
D. They are larger than many other species.