质量为0.5kg的物体从8m高处落到地面，重力对该物体做的功是 J，

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问题填空题

质量为0.5kg的物体从8m高处落到地面，重力对该物体做的功是 J，物体的能减小能增大；若不计空气阻力，则物体增加的能是．

答案

39.2；重力势；动；动；39.2J

阅读理解

阅读理解.

Look around you. Perhaps you do not see any water. But it is there. More than half of your own

body is made of water. Growing plants have a water, too. You may want to know how much water

there is in your food. A hamburger is half water. A loaf of bread looks quite dry,but it has a whole glass

of water. And a water-melon would be only as big as a baseball if you take away all the water.

1. __________of your body is made of water.

A. Half

B. Less than half

C. More than half

D. A quarter

2. __________is halfwater.

A. Your body

B. A hamburger

C. A loaf of bread

D. A plant

3. The last sentence tells us ___________in a watermelon. .

A. there is so much water

B. there is only some water

C. there is little water

D. there is no water

4. Water is_____________

A. nowhere

B. anywhere

C. everywhere

D. bad

5. A loaf of bread has____________

A. much water

B. no water

C. a whole glass of water

D. half a glass of water

单项选择题

将整个办公自动化系统按照不同的功能和层次划分为一个功能简单明确且相对独立的部分，这些部分叫作( )

A．模块

B．代码

C．层次

D．流程图