问题 单项选择题

心肌不会产生强直收缩,其原因是

A.心肌是功能上的合胞体

B.心肌有自动节律性

C.心肌收缩时Ca2+来自细胞外

D.心肌有效不应期特别长

E.心肌呈“全或无”式收缩

答案

参考答案:D

阅读理解

阅读下列短文,从各题A 、B 、C 、D 中选出能回答所提问题或完成所给句子的最佳答案。

     John gets up early from Monday to Saturday, because he must go to school before 7:30 on weekdays

  and go to the Drawing Club at 8:00 on Saturday mornings. He usually goes to the bookshop on Saturday

  afternoons, and after supper he watches TV until (直到) midnight.

     He doesn't get up early on Sundays. He often gets up at 10 a.m. And he always watches TV after he

  gets up. John's parents both work on Sundays, so he usually goes to KFC to have a hamburger and

 some juice for lunch. After that, he goes back home and starts to play computer games until his parents

 come back. He does his homework after supper. He usually has lots of weekend homework, so he must

 spend three hours on it. He usually goes to bed at about 11:00 on Sunday evenings. He often complains 

 (抱怨) he has too much homework to do.

1. How often does John need to get up early?

    A. Every day.                  

    B. Five days a week.

    C. Only at the weekend.          

    D. Every day except on Sundays.

2. What does John do on Sunday mornings?

    A. He goes to have lessons.        

    B. He goes to a club.

    C. He goes to the bookshop.    

    D. He watches TV.

3. When does John do his weekend homework?

    A. On Sunday evenings.          

    B. On Sunday mornings.

    C. On Saturday evenings.        

    D. On Sunday afternoons.

4. Why does John have lunch in KFC on Sundays?

    A. Because he's too busy.        

    B. Because his parents aren't at home.

    C. Because he gets up too late.    

    D. Because his parents have lunch in KFC.

5. Which of these is not right?

    A. John watches TV after supper on Saturdays.

    B. John doesn't exercise on Sundays.

    C. John watches much TV on Sunday afternoons.

    D. John goes to bed late on Saturday and Sunday evenings.

单项选择题 A1型题