连词成句。

1. do, what, you, to, want, do (?)

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2. go, to, Let's, the, shop, silk (.)

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3. you, do, what, want, buy, to (?)

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4. us, Let, shopping, go (!)

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睡眠不足可导致（）

A.注意力下降

B.记忆力下降

C.加速衰老

D.体重减轻