问题 单项选择题

CD3+、CD8+是指下列何种细胞的标志物( )

A.总T细胞
B.辅助性T细胞
C.细胞毒性T细胞
D.NK细胞
E.B细胞

答案

参考答案:C

填空题
阅读理解

阅读理解。

     My most memorable experience will stay in my mind forever. For most people,horses are just animals

that should

only be used for racing. Ever since I was a child,my dream was to ride a horse. When that time finally

came,my heart

beat a thousand times a minute.

     It was a warm summer day,and we were at a park. My mom was buying several things for home

while I wandered

around to find something interesting. Suddenly I found a horse standing down the block. I ran up to it, not even knowing

how to pet it,just excited to see the most beautiful animal. He was shining white,with a well-brushed tail.

Where was

the owner?

    Right away I made up my mind to ride this horse. I found my mom and dragged her to where the horse was. The

owner was back and stated that I couldn't ride it. Tears flooded down my cheeks as my mom tried to

convince the man to let me ride the horse. He finally agreed for a costly price.  Being on the horse

awakened all the senses in me. I was the happiest little girl,having the time of my life. I began planning to

buy a horse after I became a millionaire.  Before I

knew it,the ride was over. Surprisingly,l actually leamed to control the horse.

    That day was probably the happiest time of my life. Most children wouldn't have as much fun as I did.

Several years later,I began to get involved in show jumping. If it weren't for that special experience, I

wouldn't be able to enjoy the most amazing sport.

1. The writer wanted to ride the horse because ____.   

A. she could.control the horse well

B. she knew she would ride the horse for free

C.  she expected to take part in the show jumping

D.  she fell in love with the horse at the first sight

2. The writer was _____ when her mother tried to persuade the owner of the horse.  

A.worried        

B. satisfied          

C. proud          

D. tired

3. From the passage,we can infer that ____.

A. the horse owner was a kind and rich man

B. the horse was one of the best horses in the area

C. the experience opened doors for her to get into the sport

D. the writer's mother loved the horse as much as her daughter