七音

During the day we work and play, and at night we sleep. Our body rests when we sleep. In the morning we are ready to work and play again. Our body grows most when we are asleep. Children who are tired usually need sleep. We can get better at our lessons after having plenty of rest. Boys and girls who are eight or nine years old need ten hours of sleep every night. Our body needs plenty of air when we are asleep. If we do not get enough fresh air, we will feel tired when we wake up. While in bed we must not cover our head，our lungs need to get enough fresh air. If we open our windows at night, we can have plenty of fresh air. Cool air is better than warm air. Boys and girls who want to be strong must get plenty of sleep.

小题1:Our body grows most while we are _______.

A. exercising   B.playing C.sleeping

小题2:Too little sleep makes us _______.

A.tired   B.hungry  C.happy

小题3:_______ during the sleep may cause us to feel tired in the morning.

A.Too much air  B.Not enough fresh air   C.Too much cold air

小题4:How many hours of sleep should 9-year-old children have every night?

A.8 hours.  B.9 hours.  C.10 hours.

小题5:What do the lungs need most?

A.Fresh air.        B. Exercise.        C.Warm air.

秘书职能环境中利益障碍的表现形式是？

能使纤维蛋白（原）降解的物质是（）

A.纤溶酶原激活物

B.纤溶酶原激活抑制物

C.纤溶酶

D.凝血活酶

E.凝血酶

俄林波斯神统

对于PP—R管道系统，水压试验一般要求在管道连接安装（）h后进行。

A.12

B.24

C.36

D.48