小华同学的家里在这个月使用了102度电．几个同学有如下的说法，正确的是（ ） A

根据乙炔气体完全燃烧时的反应：2C₂H₂+5O₂ ="==" 4CO₂+2H₂O ，可以写出如下的符号式：

ν(C₂H₂) : ν(O₂) : ν(CO₂) : ν(H₂0）="=" 2 : 5 : 4 : 2。据此知识，下列说法错误的是

A．参加反应的乙炔和氧气的化学计量数之比为2 : 5

B．参加反应的乙炔和生成的二氧化碳的分子个数比为1 : 2

C．参加反应的乙炔和氧气的质量比为2 : 5

D．参加反应的乙炔和生成的二氧化碳的体积比为1 : 2

以惊悸不宁、烦躁失眠为主的证候是( )

A．痰蒙心神证
B．胆郁痰扰证
C．痰火扰神证
D．瘀阻脑络证
E．心阴虚证

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, that he loved computer games, basketball and history, and that 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 some television. The afternoon passed happily with a few laughs and some small talk, and 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 my 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.”

小题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小题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小题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小题4:In this passage, the phrase “break up” means _______.

A．相处很好

B．和好如初

C．关系破裂

D．保持联系小题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

齿轮的啮合质量包括适当的（）和一定的（）以及正确的接触位置。

在锅炉燃烧过程自动调节系统中，燃料量、送风量和引风量是被调量。