【单选题】【消耗次数：1】
30. -May I borrow these three magazines? -____. You may keep them for two weeks.
①
Of course not
②
By all means
③
I’m afraid not
④
It’s up to you
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so
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【单选题】
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①
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②
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β，γ，α1，α2球蛋白，白蛋白
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