单选题：Which of the following best expresses the main idea of this

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题目类型：单选题
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题目内容：

Which of the following best expresses the main idea of this passage? A．An antigen is any substance that triggers an immune respons
B．One of the immune system’s primary functions is the allergic respons
C．The human body is an appropriate habitat for microbe
D．The basic function of the immune system is to distinguish between self and nonself

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For some　obscure reason，the simple game is becoming very pop

For some　obscure reason，the simple game is becoming very popular． A．obvious B．ma

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I got a note from Moira urging me to get in touch．

I got a note from Moira urging me to get in touch． A．instructing B．pushing C．not

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Mary gets up at the same time every morning．

Mary gets up at the same time every morning．A．arises B．raises C．arrives D．stands

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The phrasal verb rounding up in paragraph 1 could be best re

The phrasal verb rounding up in paragraph 1 could be best replaced by __________

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Confronted with a severe shortage of water supply, the city'

Confronted with a severe shortage of water supply, the city's Water and Sewerage

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