试题与答案

---I’m very tired these days because of

题型:选择题

题目:

---I’m very tired these days because of studying for the coming monthly exam.

---Why not ______ muisc?  It can make you _______.

A.listen to; relaxing

B.to listen to; to relax

C.listening to; relax

D.listen to; relax

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析:根据题意,由等差数列-5,-2,1,…,首项为-5,公差为3,则可知前20项的和为 ,故选B.点评:根据等差数列的求和公式,结合基本量首项和公差来得到求和,属于基础题。

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