问题 单项选择题

甲型强心苷与乙型强心苷结构主要区别点是

A.不饱和内酯环不同

B.糖链连接的位置不同

C.内酯环的构型不同

D.内酯环的位置不同

E.C/D环稠合的方式不同

答案

参考答案:A

解析:根据C17不饱和内酯环的不同,强心苷元可分为两类。C17侧链为五元不饱和内酯环即甲型强心苷元。C17侧链为六元不饱和内酯环即乙型强心苷元。

阅读理解

阅读理解。

     Motor racing is a very exciting sport, but it is also very dangerous. Racing drivers go at 200 kilometers per

hour and even faster. Sometimes the cars crash (撞车) and the drivers die.

     This is Kirsten Kolby. When she was a little girl, she and her brother learned to drive go-Karts, and she

became good at it. When she was 12, she was the best young driver in her country. Now she drives racing

cars.

      Most racing drivers are men. Is this a problem for Kirsten?

     "Sometimes." is her answer," Some men don't like a woman driver in front of them. They get angry."

     Is she afraid of crashing?

     "I had a bad crash two years ago. The car rolled over. I was under it and I couldn't move. There was a

fire, and I couldn't get out. A man rushed through the fire and pulled me out. He was a very brave man. After

I came out of hospital, I tried to race again, but I was too afraid of fire. So I stopped racing and got a different

job. But I wasn't happy. I really wanted to race again. I wanted it very much. So now I'm racing again. I'm still

afraid, but I'm stronger than my fear."

阅读短文,根据短文内容,完成下列任务. 任务一:回答问题.

1. Are racing drivers safe?

_____________________________________________

2. What happened to Kirsten two years ago?

_____________________________________________

任务二:将文中画线句子译成汉语.

3.___________________________________

任务三:完成句子.(每格一词)

4. Kirsten became the best young driver in her country when she was _____ _____ _____.

5. After Kirsten came out of hospital, she _____.

A. tried to race again

B. gave up racing and changed a new job

C. was unhappy

D. went on racing

单项选择题