题目内容

【单选题】Question 25:

A. Protect the eyesight of the younger generation.
B. Take effective measures to raise productivity.
C. Realize the disruptive effects of technology.
D. Ensure they have sufficient sleep every day.

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[音频]【单选题】Question 19 to 21 are based on the passage you have just heard. Question 19:

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

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【单选题】Question 20:

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

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【单选题】Question 21:

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

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下列哪种方式把物质从生物膜的一侧运输到另一侧时，不需要能量

A. 简单扩散
B. 胞吐作用
C. 胞吞作用
D. 主动运输
E. 吞噬作用

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【单选题】Question 25:

A. Protect the eyesight of the younger generation. B. Take effective measures to raise productivity. C. Realize the disruptive effects of technology. D. Ensure they have sufficient sleep every day.

[音频]【单选题】Question 19 to 21 are based on the passage you have just heard. Question 19:

【单选题】Question 20:

【单选题】Question 21:

下列哪种方式把物质从生物膜的一侧运输到另一侧时，不需要能量

A. Protect the eyesight of the younger generation.
B. Take effective measures to raise productivity.
C. Realize the disruptive effects of technology.
D. Ensure they have sufficient sleep every day.