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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