根据相关规定，( )是保证币值稳定和金融安全的重要条件。 A．境内不得流通外汇 B

阅读短文，选择正确的答案。

      My name is John. I have a happy family. We share (分享) the housework. My mother can cook the meals

and wash the clothes. My father can sweep the floor. I can clean the bedroom.

1. What can John's mother do?

A. She can clean the window.

B. She can cook the meals.

C. She can water the flowers.

2. What can John's father do? 

A. He can clean the door.

B. He can sweep the floor.

C. She can empty the trash.

3. What can John do?

A. He can clean the bedroom.

B. He can clean the floor.

C. He can cook the meals.

如果不受重力作用，下列说法中不可能发生的是 [ ]

A. 瀑布将从此消失

B. 人轻轻一跳就离开地球

C. 物体将失去质量

D. 大气层不复存在

常见的胃肠胰病理表现不包括（）

A.消化性溃疡

B.胰腺炎

C.营养、吸收和消化不良

D.胃肠胰内分泌肿瘤

E.口腔溃疡

我国开展较系统的卫生服务研究起始

A．20世纪
B．60年代末
B．70年代初
C．70年代末
D．80年代初
E．80年代末