问题 选择题

下列图示实验操作正确的是(  )

                 

A.振荡试管

B.闻气体气味

C.过滤

D.取用固体粉末

答案

答案:D

题目分析:A、振荡试管时,振荡的正确方法是用手腕的力左右摆动,图中所示操作错误.

B、闻气体的气味时,应用手在瓶口轻轻的扇动,使极少量的气体飘进鼻子中,不能将鼻子凑到集气瓶口去闻气体的气味,图中所示操作错误.

C、过滤液体时,要注意“一贴、二低、三靠”的原则,图中缺少玻璃棒引流,图中所示操作错误.

D、取用粉末状药品,试管横放,用药匙或纸槽把药品送到试管底部,图中所示操作正确.

故选D.

点评:本题难度不大,熟悉各种仪器的用途及使用注意事项、掌握常见化学实验基本操作的注意事项是解答此类试题的关键.

阅读理解

阅读理解。

      Once upon a time there was a monster. He was very ugly, and had no friends. No one wanted to

talk to him. Even other monsters thought he was ugly.

      He lived alone and was very unhappy because he was so lonely.

     "I wish I had a friend." he said to himself every day. "One friend would be enough. Someone to

talk to."

      "Dear Editor." he wrote. " I am an ugly monster. How can I find a friend?"

      "Dear Monster." the Editor replied. " Advertise for a friend in this magazine."

      The monster wrote an advertisement.

      "Monster wants a friend, male or female. I have two heads, four arms, six legs and here tails. I have

one blue eye, one green eye and one brown eye. Smoke comes out of my noses. But I am really a kind

monster and will be a good friend to someone. If you would like to meet me, please stand outside

Blake's Store at 6 p.m. on Friday, May 22nd. Write to me at Box 45. Everybody's Magazine."

      A few days later he went to the magazine.

      "Do you have any letters for Box 45?" he asked.

      The Editor looked in Box 45.

      "Yes, there is one." she said, and gave it to him.

      The monster opened the letter, and read, "Dear Monster, I think a person's character is more

important than his appearance. I will wait outside Blake's Store on Friday. Please carry a flower so

that I will recognize you. Yours sincerely, Miss Alice Thwaite."

1. Why was the monster unhappy?

A. He had no friends.

B. He was ugly.

C. He had two heads.

D. He had three tails.

2. What did the monster advertise for?

A. A magazine        

B. A friend

C. An editor          

D. A male monster

3. How did the monster describe himself in the advertisement?

A. Bad              

B. Lonely

C. Kind            

D. Different

4. What was strange about Miss Thwaite's letter?

A. She was not interested in people's appearances.

B. She wanted to meet the monster.

C. She needed a flower to recognize him by

D. It was the only reply

单项选择题