一Climate change________mainly by too much CO 2 in the air.一So I think the key is

一Climate change________mainly by too much CO 2 in the air.一So I think the key is

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一Climate change________mainly by too much CO 2 in the air.
一So I think the key is to produce electricity without creating CO2
A.is caused    B.caused         C.causes
答案
A
解析

试题分析:句意:--气候变化主要由于空气中的二氧化碳太多而引起的。--因此我认为关键是通过不排放二氧化碳的情况下发电。这里句子的主语Climate change与cause之间是被动关系,故选A。
举一反三
—Tom! I looked for you everywhere at the party last night.
—Oh, I          to the party.
A.am invited B.was invited
C.am not invited D.wasn’t invited

题型:不详难度:| 查看答案
Mom, the telephone is ringing. I guess either you or Dad           on the phone.
A.is wantedB.are wanted
C.wantD.wanted

题型:不详难度:| 查看答案
.The school meeting ________ once every two weeks in the concert hall.
A.is heldB.was held
C.will be heldD.has been held

题型:不详难度:| 查看答案
Sorry, there is no Yangzhou Fried Rice now. It ______ only for lunch and supper.
A.servesB.served
C.is servedD.is serving

题型:不详难度:| 查看答案
—Mr Wang, I’m afraid I can’t finish this task by myself.
—Don’t worry. Two more helpers _______ soon.
A.have been foundB.will be found
C.are foundD.were found

题型:不详难度:| 查看答案
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