圆柱的高有______条，圆锥的高有______条．

阅读理解。

    Lingling is going to have a party on Saturday night. She has to shop and clean the house. She is

shopping for the food on Saturday  morning.  Her friends like hamburgers and ice cream. In the

afternoon, she's cleaning the living room and kitchen. She wants to go to the movies at 3:00, but she

has to babysit her brother from 2:00 to 4:00. At 6:00 she's having dinner and the party is at 7: 00.

     Judy is coming to the party. She wants to help Lingling on Saturday, but she can't. She has a soccer

game in the morning. And in the afternoon, she's going to her uncle's house. She's coming to the party

at 8:00.

      Ann isn't busy this Saturday. On Saturday morning she is going to buy a present forLingling. In the

afternoon she is going to help Lingling with the cleaning. She wants to come to the party at 7:00.

阅读短文，判断正（T）误（F）。

( )1. Lingling is shopping for the food on  Saturday afternoon.

( )2. Lingling can go to the movies on Saturday afternoon.

( )3. Judy is coming to the party at 8:00.

( )4. Judy is coming to help Lingling with the shopping.

( )5. Ann is very busy on Saturday.

        是自尊的重要表现（     ）

A．自负

B．知耻

C．虚荣

D．自卑

轻度先天性上睑下垂行手术矫治的时间宜在（）

A.2岁左右

B.3岁左右

C.4岁左右

D.5岁左右

E.8岁左右

儿茶酚胺对心肌生物电活动的作用有

A．使慢反应动作电位0期Ca²⁺内流增快

B．加强自律细胞4期自动去极化速度

C．自律细胞4期的内向电流加强

D．使快反应动作电位上升速度减慢

人口因素的两重性是指人既是（），又是（）。