问题 填空题

指出下列实验操作中的错误:(请用准确的语言表述出来)

①______;②______;③______; ④______.

答案

①量取液体时,仰视,引起的后果是:量取的液体实际体积偏大;

②给试管内的液体加热时,防止液体溅出伤人,液体不能超过试管容积的

1
3
;并且因外焰温度高,用外焰加热;

③取用液体时:瓶塞倒放桌面上,防止污染瓶塞,从而污染药品;

④为防止弄破滤纸,要用玻璃棒引流.

故答为:①量液读数时视线应与量筒内凹液面最低处保持水平;

②给试管内的液体加热时,液体不能超过试管容积的

1
3
,并用外焰加热;

③取下的瓶塞应倒放在实验台上;

④过滤实验中要用玻璃棒引流.

解答题
阅读理解

Once upon a time in a land far away, there was a wonderful old man who loved everything:animals, spiders, insects.

One day while walking through the woods, the nice old man found a cocoon(茧)of a butterfly.He took it home.A few days later, a small opening appeared; he sat and watched the butterfly for several hours as it struggled to force its body through that little hole.Then it seemed to stop making any progress.It appeared as if it had gotten as far as it could and it could go no farther.Then the man decided to help the butterfly, so he took a pair of scissors and cut off the remaining bit of the cocoon.

The butterfly then appeared easily.

But it had a swollen body and small, fragile wings.The man continued to watch the butterfly because he expected that, at any moment, the wings would enlarge and expand to be able to support the body, which would be smaller in time.Neither happened! In fact, the butterfly spent the rest of its life crawling (慢慢爬行)around with a swollen body and fragile wings.

It never was able to fly.

What the man in his kindness and hurry did not understand was that the limited cocoon and the struggle required for the butterfly to get through the tiny opening were Nature's way of forcing fluid from the body of the butterfly into its wings so that it would be ready for flight once it achieved its freedom from the cocoon.

Sometimes struggles are exactly what we need in our life.If we were allowed to go through our life without any obstacles and difficulties, it would disable us.We would not be as strong as what we could have been.And we could never fly.

小题1:The butterfly could never fly because _______________.

A.it was too fat and strong.

B.it loved crawling around.

C.it got out of the cocoon easily.

D.it didn’t get through the cocoon.小题2:The text is most likely to be found in a book about_______________.

A.popular science

B.humorous stories.

C.successful people

D.philosophyevents小题3:What is the implied meaning of the passage?

A.Life without any obstacles and difficulties is perfect.

B.Obstacles and difficulties contribute to success.

C.Never help a butterfly to get out of the cocoon.

D.A butterfly can never fly without going through the cocoon