问题
选择题
A balloon as it is filled with air.
A．is increased
B．increases
C．expands
D．is expanded
答案
C
句意：气球灌入空气就会鼓起。expand扩展，鼓起，膨胀，被动语态不合适，故选C。
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A balloon as it is filled with air.
A．is increased
B．increases
C．expands
D．is expanded
C
句意：气球灌入空气就会鼓起。expand扩展，鼓起，膨胀，被动语态不合适，故选C。