2. 外语
  3. A tyre______when you pump air into it; it shrinks when the air is gone.

A tyre______when you pump air into it; it shrinks when the air is gone.

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问题 A tyre______when you pump air into it; it shrinks when the air is gone.
选项 A、explores
B、expands
C、exploit
D、exposes
答案B
解析 句意为：当你打气进去时，轮胎会胀大。根据句意，B项expands“膨胀”符合句意，故选B项。其他三项，explore“探索”、exploit“开拓”、expose“揭露”，均不符合句意。
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