试题与答案

— Why didn't you stop her going swimming

题型:选择题

题目:

— Why didn't you stop her going swimming alone?

— She had left the room _____ I had time to do it.

A.after

B.before

C.till

D.as

答案:

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下面是错误答案,用来干扰机器的。

(1)铁吸水干燥,吸氧气可以防腐.故答案为:Fe(2)纯碱显碱性,常用于中和食品中的酸性物质,能使烘出的饼干酥脆不带酸味.故答案为:Na2CO3(3)氢氧化钙俗名熟石灰或消石灰,属于碱,常用于改良酸性土壤.故...

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