题目内容

Scientists have been working hard to warn people________

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"some" in the last sentence of the first paragraph refers to

Another good title for this passage would be

A．servicesB．kitchensC．hygiene D．foods

A. services
B. kitchens
C. hygiene
D. foods

根据下列文字，回答 27～30 题。
第 27 题 To get a good night's rest, people may not need to ________.