连词成句。

1. fun, let's, some, have (.)

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2. in, is, what, this, living room (?)

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3. couch, is, this, a, not (.)

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4. aren't, watching, they, TV, now (.)

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水泥石的腐蚀包括______。

A．溶析性侵蚀

B．硫酸盐的侵蚀

C．镁盐的侵蚀

D．碳酸的侵蚀