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、contacts
B、expands
C、breaks
D、shrinks
答案B
解析 句意为：当你打气进去，轮胎会胀大。根据句意，B项expands“膨胀”符合句意，故选B项正确。其他三项，contact“缩小”，break“破裂”，shrink指新衣服缩水，均不符合句意。
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