葡萄酒的年份酒和白酒的年份酒概念不一样，白酒年份酒是指，葡萄酒年份酒是指（） A.原

Eating in space is different from eating on the earth. The food that astronauts carry with them does not look like the food you eat.

Some food is carried in closed bags. It is cooked and frozen before the astronauts get it. All the water is removed from the food. In the spaceship, the astronaut puts the water back. He “shoots” hot or cold water into the food bag with a special gun. He eats the food through a small hole in the bag.

Other foods come in bite sizes. The astronaut puts a whole piece in his mouth at once. There can be no crumbs. Crumbs would float around the spaceship and get in the way. Meat and cakes often come in bite-size pieces.

Astronauts cannot drink water from open cups. The water would float in drops in the spaceship. The water is put in the special gun. The astronaut shoots the water into his mouth.

小题1:Some food carried in the closed bags by astronauts is ________.

A. cooked and frozen      B. full of water            C. raw

小题2:Astronauts can’t drink from open cups because__________.

A. the water would float in drops around the spaceship

B. the water would spill all over their foods

C. crumbs would float in the cups

小题3:The main idea of the passage is that __________.

A. astronauts cannot eat or drink in a spaceship until they come back to the earth

B. eating and drinking in the spaceship is a special problem

C. there is more food and water in space than on the earth

想一想你在实际中有没有遇到过以下几种情况：

（1）踢足球的时候，你用力一脚把球踢出后，球在草地上一直滚到很远的地方． 

（2）在家里大扫除的时候，你想打扫衣柜后面，你用力推大衣柜，却怎么也没有推动．

（3）起重机运送货物，首先把货物从地上匀速吊起到一定高度，然后再水平移动到指定位置．

根据功的概念，你能判断以上三种情况中，脚踢球的力、你推大衣柜的力、起重机对货物向上的拉力是否都做了功？

单扇区8通道的RRH的安装过程中，除电源线、GPS线缆和光纤外，还涉及（）根馈线的安装。

A.8

B.10

C.12

D.9

矮子丕平接受教皇皇冠表明了（）

A.西欧封建社会等级森严

B.罗马教廷有至高无上的权力

C.教皇和教会是西欧封建社会最大的土地所有者

D.在西欧封建社会的精神和文化领域神权凌驾一切

肾为耳窍之主，（）为耳窍之客