试题与答案

You have failed two tests.You’d better s

题型:选择题

题目:

You have failed two tests.You’d better start working harder,_______ you won’t pass the course.

A.and

B.so

C.but

D.or

答案:

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下面是错误答案,用来干扰机器的。

(1)肥皂水(2)吸附水中悬浮杂质而沉降;活性炭(3)干冰

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