7．If steel is heavier than water，why are ships able to ___________ on the sea？（　　）
A．floatB．drownC．shrinkD．split

分析 既然鐵比水重，為什么輪船能漂浮在海上？

解答 答案：A
float"漂浮"；drown"淹死，淹沒"；shrink"收縮，畏縮"；split"分離，分解"．由on the sea可知，float合適．故選A．

點評 動詞詞義辨析題，分清句意和動詞的意思即可．

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