搜题请搜索小程序“爱下问搜题”
问题 不定项选择题

下列叙述中不正确的是[ ]

A．卤化氢分子中，卤素的非金属性越强，共价键的极性越强，稳定性也越强

B．以极性键结合的分子，一定是极性分子

C．判断A2B或AB2型分子是否是极性分子的依据是具有极性键且分子构型不对称，键角小于 180°的非直线形结构

D．非极性分子中，各原子间都应以非极性键结合

答案

BD

阅读理解
阅读理解。

        Mark was walking home from school one day when he saw the boy in front of him fall over and drop all
of the books he was carrying, along with two sweaters, a basketball and a walkman (随身听). Mark stopped
and helped the boy pick up these things. Since they were going the same way, he helped to carry some of his
things. As they walked, Mark knew that the boy's name was Bill, and he loved computer games, basketball and
history, and he was having lots of troubles with his other subjects and that he had just broken up with his
girlfriend. 
        They arrived at Bill's home first and Mark was invited in for a coke and to watch television. The afternoon
passed happily with a few laughs and some small talks, then Mark went home. They often saw each other at
school, had lunch together once or twice, and then they both finished middle school. They ended up in the same
high school where they sometimes saw and talked with each other over the years. At last just three weeks           before they finished high school, Bill asked Mark if they could talk?
          Bill asked Mark if he still remembered the day years ago when they had first met." Did you ever think
why I was carrying so many things home that day?" asked Bill. "You see, I cleaned out my locker (锁柜)
because I didn't want to leave anything for anyone else. I had put away some of mother's sleeping pills and I was going home to kill myself. But after we spent some time together talking and laughing, I began to understand that
if I killed myself, I would have missed that time and so many others that might follow. So you see, Mark, when
you picked up those books that day, you did a lot more. You saved my life."

1. When Mark met him the first time, Bill was going ________.
[ ]

A. to have a basketball game
B. to his classroom 
C. to see Mark
D. back home 

2. From what Bill was carrying, we can know that he ________.
[ ]
A. was a good student
B. liked sports and music 
C. liked all the subjects in school
D. was a good friend
3. Mark and Bill ________.
[ ]
A. were in the same middle school and high school
B. were in the same middle school but not in the same high school
C. often had lunch together at school
D. had known each other before they began to study in middle school
4. In this passage, the phrase "broken up" means "_______".
[ ]
A. 相处很好
B. 和好如初
C. 关系破裂
D. 保持联系
5. When Mark helped Bill to pick up some of his things, he              .
[ ]
A. knew he could save Bill's life
B. knew who Bill was and wanted to help him
C. didn't know why he was going to help him
D. didn't know what he was doing was very important to Bill
查看答案
判断题

只有对自己负责任的人，才有资格、有信心承担对他人、对社会的责任。
查看答案