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【判断题】
优质蟹背甲壳青黑色或黄灰色，腹部黑橙色或黄锈色。
A.
正确
B.
错误
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【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
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【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
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