单项选择题

Recent research into aging suggests that the body's defense mechanisms may lose the ability to distinguish what is alien.

A．insane
B．infectious
C．foreign
D．poisonous

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单项选择题

Man: I've made a decision about my term paper. It's going to focus on the Industrial Revolution. Woman: That might not be approved—it seems too broad. Question: What does the woman imply

A．She implies that she also wants to write about the Industrial Revolution.
B．She implies that she might also write the term paper.
C．She implies that he should get started right away.
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Man: What should we do tonight Woman: There's supposed to be a huge sale at the mall. Question: What does the woman mean

A．She wants to buy food.
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