学生体育课运动量适宜时应为（）。

A.脉搏数在基本部分保持在130～180次/分

B.脉搏指数维持在1.8～2.0之间

C.平均脉搏维持在150～180次/分

D.脉搏数在课后15分钟恢复到安静时水平

E.脉搏数在结束部分下降为150～120次/分

句型转换。

1. My uncle is forty-two years old. (对划线部分提问)

    _______ ________ is your uncle?

2. He likes watching TV very much. (改为否定句)

    He ________ _________ watching TV at all.

3. My little brother often does his homework at home on Sundays. (改为一般疑问句)

    _______ little brother often ________ his homework at home on Sundays?

4. She flies kites with her sister on Sunday. (用now替换时间状语on Sunday)

    She  ________ kites with her sister now.

5. His friend has one marker. (对划线部分提问)

   How ________ markers ________ his friend _______?