问题 选择题

下列说法正确的是(  )

A.铁在潮湿的空气中容易生锈

B.金属的活动性:Zn>Ag>Cu

C.合金属于纯净物

D.铝是地壳中含量最多的元素

答案

A、铁在有水和氧气并存时易生锈,故A正确;

B、在金属活动性顺序中,锌>铜>银,故B错误;

C、合金是在一种金属中加热熔合其他金属或非金属而形成的混合物,故C错误;

D、铝是地壳中含量最多的金属,故D错误.

故选A.

完形填空
阅读下面短文,掌握其大意,然后从21~40各题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。
When I was a law professor, a student reported that I made an error in grading his exam by giving him too many points. He was         and after thanking him for his honesty, I changed the          in my records. His beaming (欢笑的) face turned to         “You’re lowering my grade?” he said angrily. “I would never have come in          ……”
He didn’t finish the          but it was obvious that his display of honesty was false. He thought he’d have it all—praise and the          grade.
Several colleagues thought I should have let the higher grade stand        all I’d accomplished was to discourage him from being         in the future. And every time I tell this         , some people agree with this remark.
But I can’t see how I could give good          for worsening my mistake in grading by undermining (损害) the honesty of all my grades by failing to          an error. The grade itself would be a dishonest reflection of his          and it would have been         to other students. How could I possibly give a          a gift of an unearned grade?
I know voluntarily reporting an error in one’s favor is         , but, like          extra change, it’s the         thing to do. People with real honesty, hate to give up benefits as mush as anyone else. The difference is that for them a good conscience and reputation is reward enough to give reason for the cost of doing the right thing.
Perhaps         the student’s grade did discourage him from being honest in the future, but bribing (贿赂) him to be honest so that he does the right thing when it’s cost-free would have         him even more. The duty to be honest is         right and wrong, not risks and rewards.
小题1:
A.wiseB.rightC.rigidD.angry
小题2:
A.fileB.noteC.nameD.grade
小题3:
A.griefB.shockC.happinessD.careless
小题4:
A.whetherB.whichC.ifD.what
小题5:
A.sentenceB.wordC.examD.lesson
小题6:
A.higherB.lowerC.moreD.less
小题7:
A.suchB.because C.soD.whether
小题8:
A.braveB.adventurousC.honestD.successful
小题9:
A.manB.storyC.wayD.exam
小题10:
A.reasonB.causeC.excuseD.result
小题11:
A.makeB.findC.avoidD.correct
小题12:
A.reactionB.senseC.signD.knowledge
小题13:
A.unfairB.cruelC.toughD.funny
小题14:
A.peopleB.teacherC.studentD.worker
小题15:
A.activeB.oftenC.unusualD.curious
小题16:
A.receivingB.returningC.earningD.paying
小题17:
A.manyB.wellC.badD.right
小题18:
A.lowering B.influencing C.protect ingD.separating
小题19:
A.ruinedB.encouragedC.improvedD.blamed
小题20:
A.inB.afterC.about D.during
单项选择题