问题 选择题

如图所示是一种新近开发的固体氧化物燃料电池.它以掺杂氧化钇(Y2O3)的氧化锆(ZrO2)晶体为固体电解质,在熔融状态下传导氧离子(O2-),其中多孔电极a、b均不参与电极反应.下列判断不正确的是(  )

A.采用多孔电极的目的是易于吸附气体

B.有H2放电的b极为电池的负极

C.a极对应的电极反应为O2+2H2O+4e-=4OH-

D.b极对应的电极反应为2H2-4e-+2O2-=2H2O

答案

A.多孔电极表面积较大,具有较强的吸附能力,于吸附气体,故A正确;

B.H2具有还原性,为原电池的负极,另外由阴离子的移动方向也可知b极为电池的负极,故B正确;

C.通入空气的一极为原电池的正极,发生还原反应,由于电解质为非水物质,则电解质中不存在OH-离子,电极反应式为O2+4e-=2O2-,故C错误;

D.H2具有还原性,被氧化,电极反应式为2H2-4e-+2O2-=2H2O,故D正确.

故选C.

阅读理解

Long bus rides are like television shows. They have a beginning, a middle, and an end with commercials thrown in every three or four minutes. The commercials are unavoidable. They happen whether you want them or not. Every couple of minutes a billboard glides by outside the bus window. "Buy Super Clean Toothpaste.” Drink Good Wet Root Beer.” Fill up with Pacific Gas.” Only if you sleep, which is equal to turning the television set off, are you spared the unending cry of "You Need It! Buy It Now!"

The beginning of the ride is comfortable and somewhat exciting, even if you’ve traveled that way before. Usually some things have changed new houses, new buildings, sometimes even a new road. The bus driver has a style of driving and it’s fun to try to figure it out the first hour or so. If the driver is particularly reckless (鲁莽的) or daring, the ride can be as thrilling (惊心动魄的) as a suspense story. Will the driver pass the truck in time? Will the driver move into the rightor the lefthand lane? After a while, of course, the excitement dies down. Sleeping for a while helps pass the middle hours of the ride. Food always makes bus rides more interesting. But you’ve got to be careful of what kind of food you eat. Too much salty food can make you very thirsty between stops.

The end of the ride is somewhat like the beginning. You know it will soon be over and there’s a kind of expectation and excitement in that. The seat of course, has become harder as the hours have passed. By now you’ve sat with your legs crossed, with your hands in your lap, with your hands on the armrests even with your hands crossed behind your head. The end comes just at no more ways to sit.

小题1:According to the passage, what do the passengers usually see when they are on a long bus trip?

A.Buses on the road.

B.Films on television.

C.Advertisements on the billboards.

D.Gas stations.小题2:What is the purpose of this passage?

A.To give the writer’s opinion about long bus trips.

B.To persuade you to take a long bus trip.

C.To explain how bus trips and television shows differ.

D.To describe the billboards along the road.小题3:The writer of this passage would probably favor        .

A.bus drivers who aren’t reckless

B.driving alone

C.a television set on the bus

D.no billboards along the road小题4:The writer feels long bus rides are like TV shows because          .

A.the commercials both on TV shows and on billboards along the road are fun

B.they both have a beginning, a middle, and an end, with commercials in between

C.the drivers are always reckless on TV shows just as they are on buses

D.both traveling and watching TV are not exciting.小题5:The writer thinks that the end of the ride is somewhat like the beginning because both are .

A.exciting

B.comfortable

C.tiring

D.boring

单项选择题