问题
选择题
小华制成如图所示的“自动给水装置”，是用一个装满水的塑料瓶子倒放在盆景中，瓶口刚好被水浸没。其瓶中水面能高于盆内水面，主要是由于
A、瓶的支持力的作用
B、瓶的重力作用
C、水的浮力作用
D、大气压的作用
答案
答案：D
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小华制成如图所示的“自动给水装置”，是用一个装满水的塑料瓶子倒放在盆景中，瓶口刚好被水浸没。其瓶中水面能高于盆内水面，主要是由于
A、瓶的支持力的作用
B、瓶的重力作用
C、水的浮力作用
D、大气压的作用
答案：D
| 完形填空。 What will the life in the 2lst century be like? I'm sure it will be different from life in the 20th century, because many changes will take place in the new century. The population is 1 fast. There will be more and more people in the world and most of them will live 2 than before. 3 will be much smaller and more useful, and there will be at least one in every home. And computer studies will be one of the important subjects at 4 . People will work fewer hours than they did in the 20th century, and they will have more free time for sports, 5 TV and travelling. Travelling will be 6 . And many more people will go to other countries for holidays. There will be changes in our food, too. More land will be used for building new towns and houses. Then there will be less room for cows and sheep, so 7 will be more expensive. Maybe no one will eat it every day, 8 they eat more vegetables and fruit. Maybe people will be healthier. Work in the future will be 9 , too. Dangerous and hard work will be done by robots. 10 this, many people will not have enough work to do. This will be a problem. | |||
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