连词成句。

1. from, does, rain, come, where, the (?)

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2. vapour, comes, it, the, from (.) 

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3. can, vapour, How, the, become, water (?)

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4. that, How, do, you, do (?) 

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5. you, then, what, do, should (?)

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药材大连湾牡蛎的性状是（）

A.贝壳四方形，背缘平直，腹缘圆，单壳

B.贝壳呈长片状，背腹缘儿平行，右壳较平，左壳凹陷很深

C.贝壳呈类三角形，背腹缘呈八字形。右壳外淡黄色

D.贝壳呈圆形、卵形或三角形，右壳较小，表面环生同心鳞片

E.贝壳呈类三角形，背腹缘呈八字形。右壳外淡黄色，内面红黄色