如图所示,锥形瓶内盛有气体X,滴管内盛有液体Y,若挤压滴管胶头,使液体Y滴入瓶中

题型:选择题

问题:

如图所示,锥形瓶内盛有气体X,滴管内盛有液体Y,若挤压滴管胶头,使液体Y滴入瓶中,振荡,一会儿可见小气球a鼓起。气体X和液体Y不可能是

[ ]

A. X: HCl; Y: 水

B. X: CO2; Y: 石灰水

C. X: SO2 ;Y: NaOH

D. X: CO ;Y: NaOH

考点:碱的性质
题型:选择题

阅读理解。

Just a Little Smile

     Mark was walking home from school one day. He saw the boy in the front drop all of the books he

was carrying, with two sweaters, a basketball and a walkman . 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 (邀请) in for a Coke and to watch some

television. The afternoon passed happily with a few laughs and some small talk, 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 (药片) and I was going home to kill (杀死) 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. 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. of ten had lunch together at school

D. had known each other before they began to study in middle school

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

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

题型:选择题

月球对它表面附近的物体也有引力,这个引力大小大约是地球对地面附近物体引力的1/6,一个连同随身装备共90kg的宇航员,在月球上质量为______kg,所受重力______N;实验表明,在地球上,物体质量增大几倍,重力也增大几倍,即重力跟质量成______,它们的比值是______,读作______,它表示的物理意义是______.

题型:选择题

依据母婴保健法及其实施办法规定,从事下列哪项母婴保健技术服务的人员,须经设区的市人民政府卫生行政部门许可?()

A.婚前医学检查

B.遗传病诊断

C.助产技术服务

D.产前诊断

题型:选择题

污水处理厂的试运行过程迅速,基本不受环境条件和水质水量的影响。

题型:选择题

下列哪些理化性质与盐酸普鲁卡因相符( )

A.对光敏感

B.白色结晶或结晶性粉末

C.可被水解,溶液pH对其水解速率极有影响,pH<2.5时稳定性最大

D.本品水溶液加入碘化汞钾试液产生沉淀

E.溶于水,2%水溶液pH为5.0~6.5

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