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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Color is very important to most animals for it helps them to get along in the world. Color (21) to make an animal difficult for its enemies to (22) . Many animals match their (23) so well that as lon...
A.
Even if
B.
Unless
C.
However
D.
As long as
【单选题】男性右侧腹股沟斜疝较左侧多见的主要原因是( )
A.
右侧肠腔压力高
B.
阑尾炎症反复刺激
C.
左侧精索静脉曲张发生率较高
D.
右侧鞘状突闭锁较迟
E.
以上都不是