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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】腹股沟管浅环（）。
A.
为耻骨结节外上方的三角形裂隙
B.
位于耻骨结节的外下方
C.
位于腹股沟韧带外侧半稍上方
D.
是腹股沟管外口，呈卵圆形
E.
正对腹股沟外侧窝