问题 选择题

教室内气温为25℃,小江同学在温度计的玻璃泡上涂抹少量与室温相同的酒精.如图中能比较正确地反映温度计示数随时间变化的图象是(  )

A.

B.

C.

D.

答案

酒精蒸发吸热,能使它附着的物体温度下降,低于25℃.随着酒精迅速蒸发掉后,受空气温度的影响,温度计的示数又会上升,直到和周围温度相同时,不再上升.即温度计的示数会从25℃下降,然后又上升到25℃.故A、B、C不合题意,D合题意.

故选D.

完形填空
When people think of tigers, they think they are strong and dangerous. But now, the big animal is calling for our help. There were once eight kinds of      in the world, but three died out during the 20th century. In the last 70 years, the      of Siberian tigers (东北虎)has gone from as many as 300 to      22 somewhere, The Siberian tiger has been      dying out completely, If the government doesn’t make any efforts, it’s quite   that there will be no more Siberian tigers in China in ten to twenty years.
In order to double the number of wild tigers in the     ten years, the World Wildlife Fund has started a program recently. It      save wild tigers and put an end to tiger hunting and killing. China, together with twelve other     ,has joined in.
Wild animals, such as red deer and wild pigs, are the main      of the tigers, The hunting of these animals is the greatest threat(危险)to tigers. So the most important thing is      the animals that tigers eat. To protect the wild tigers, we need to call on more people to stop eating and hunting wild animals.
小题1:
A.pigsB.koalosC.deerD.tigers
小题2:
A.nameB.kindC.numberD.owner
小题3:
A.less thanB.more thanC.bigger thanD.better than
小题4:
A.in need ofB.in danger ofC.in front ofD.in case of
小题5:
A.possibleB.impossibleC.necessaryD.important
小题6:
A.lastB.nextC.pastD.lastly
小题7:
A.aims toB.used toC.refuses toD.decide to
小题8:
A.citiesB.provincesC.townsD.countries
小题9:
A.friendsB.foodC.membersD.families
小题10:
A.to sellB.to killC.to saveD.to eat
单项选择题 A1/A2型题