【題目】—Let’s go out for a walk.

—You’d better not. These days the air is getting much ________ than it was before.

A. better B. worse C. cleaner D. easier

【答案】B

【解析】試題分析：句意：--讓我們出去散個步吧！最好不要去，這些天，空氣變得比以前還要糟糕。根據(jù)句意是變得更糟糕了，故選B。

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