问题 选择题

冬天,从冰箱中拿出一条冻鱼浸没在冷水盆中,则可能出现的现象是(  )

A.盆中有一部分水结冰,鱼的温度升高

B.盆中有水结冰,鱼的温度不变

C.盆中的水都结成冰,鱼的温度降低

D.盆中的水都结成冰,鱼的温度不变

答案

将冻鱼放到水中时,鱼上的冰开始从水中吸热,而且冰也达到了熔点,故鱼上的冰开始熔化,即鱼的温度升高;

盆中的冷水,向鱼上的冰放了一部分热量,而且水也达到的凝固点;故盆中的水一部分会凝固成冰;选项A正确.

故选A.

实验题
改错题

此题要求改正所给短文中的错误。对标有题号的每一行做出判断:如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:

该行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

该行缺一个词:在缺词处加一个漏字符号(^),在该行右边横线上写出该加的词。

该行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

By midday the sun was very strong. Jim was so tired                              1.      

to walk. There was no trees near the road, so he rested                                2.      

under a big rock. After drinking some water, he took his                             3.      

shirt, lying down on the ground and fell asleep at once.                                4.      

He was very tired that he didn’t wake up until the evening.                          5.      

He was just about to jump while he felt something moving                        6.      

near his feet. He looked up and saw a long black snake.                               7.      

Jim was so frightening that he didn’t dare to move. The                            8.      

snake began to crawl(爬) across his legs. It crawled on and                          9.      

on until it was disappeared under the rocks, Jim jumped                              10.     

to his feet, picked up his shirt and ran down the road.