16. Unique among bivalves, scallops swim extremely well, propelled by jets of water expelled while snapped the shell shut. 为什么选C啊～
16. In the period between 1918 and 1939, various political, economic, and geographic factors combined in determine the extent to which a country developed civil aviation. 为什么选 B？ 谢谢
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发表于 2005-5-12 00:01:00
