问题 判断题

活塞温度分布极不均匀,并进行等速的高速直线往复运动,这就要求活塞要有高的强度、小的热膨胀系数、良好的耐磨性和耐腐蚀性、好的导热性及重量要轻。

答案

参考答案:错

解析:活塞温度分布极不均匀,并进行不等速的高速直线往复运动,这就要求活塞要有高的强度、小的热膨胀系数、良好的耐磨性和耐腐蚀性、好的导热性及重量要轻。

阅读理解

Yang Nan, 17, was happy to move to her new home in a northern area of Beijing. She was told that her neighborhood used to be rich farmland planted with vegetables, corn and wheat. But looking at the new road, beautiful parks and supermarkets, to her surprise, Yang couldn't see any sign that food was once grown there.

Yang is not alone. In recent years, many Chinese people have moved into new houses in country areas. Tall buildings have been built everywhere in the suburbs. The crops and fruit trees are no more grown there. But these changes have caused big problems too, warns Gan Zangchun, an official(官员)at the Ministry of Land and Resources(国土资源部).

"Chinese cities are growing very fast. This has made the area for farmland much smaller than before. This is really bad for the country's ability to grow food, not to mention the lives of farmers," said Gan last Monday.

As the population of China is growing all the time, the country needs more farmland to grow food for the increasing people of China. But the recent rise in house prices has made selling land a good business. A lot of land has been used to build new houses for sale. So you can see, the shortage of the farmland is now a very serious problem.

Pollution, such as, oil pollution, industrial(工业) pollution and water pollution, which makes land useless, is another reason for the big drop in China's farmland. About 2.67 million square kilometers of land in China have been polluted and turned into desert.

Today, can we use less farmland to grow enough food for more people? Of course not! The government wants China to have at least 120 million hectares(公顷) of farmland. Only in this way can we raise such a big population. But there are only about 121.8 million hectares left. "It will be really difficult to reach the goal", Gan said. He said that the government would fight illegal(非法的) land use and something useful must be done to stop farmland from becoming desert.

小题1:The article seems to tell us that_____________.

A.farmland is in danger

B.countryside is turned into towns

C.farmland has been sold

D.Chinese cities are growing fast小题2:From what Gan Zangchun said, we know he is worrying about ____________.

A.China's development is too slow

B.the population of China is growing fast

C.Chinese people have worse life than before

D.the reduction(减少) and pollution of the farmland小题3:What size of the land have been polluted and turned into desert?

A.120 million hectares.

B.121.8 million hectares.

C.2.67 million square kilometers.

D.Millions of square kilometers.小题4:Which statement of the following is NOT true?

A.Yang Nan's new home is in a northern area of Beijing.

B.The country needs enough farmland so that the farmers can grow enough food for the people of China.

C.Chinese cities are growing too slowly so the government encourages people to change the farmland into towns.

D.Pollution is also an important reason for the big drop in China's farmland.小题5:What will the government do with the problem of the drop in China's farmland?

A.Government needs farmland to grow food for the people of China.

B.Government will order not to build new towns any more.

C.Government will stop the growth of the cities in order to stop selling farmland for business.

D.Government will fight illegal land use and stop farmland from becoming dessert.

阅读理解与欣赏

阅读理解。

        ①我的故乡在广西,我爱故乡的漓江。

        ②春天,原野上的春色,把漓江打扮得更美丽。细雨绵绵,增加了漓江的水量,催开了两岸鲜艳的野花。随着气候转暖,来漓江旅游的人越来越多。漓江像一条友谊的带子把祖国人民和世界人民连在一起。

        ③夏天,漓江的水更清了。人们有的在江中游泳,有的在江中划船,有的玩水球…… 漓江洗去人们一天的疲劳,使人们感到轻松愉快。

        ④秋天,桂花开了。漓江两岸飘着醉人的桂花香。我们学习过后,荡着小船在江上游玩,那两岸的青峰分明地立在我们面前。同学们兴奋地抢着划桨……

        ⑤冬天,漓江因为旱季到来而变浅了,但水还是那么清,山还是那么绿。江畔的柑橘树已经挂满了累累果实,人们正紧张地收获。  

        ⑥漓江的四季都很美,我喝着漓江的水长大,一定要把漓江建设得更加美好。

1.给文章加上题目:                                  

2.用“△”给短文分段,段与段之间是               关系。

3.分别用“           ”和“﹏﹏”画出文中的一个比喻句和一个拟人句。   

4.短文第②~⑤自然段是按            顺序写的,表示这个顺序的词语是                                

5.文中画“           ”的句子是一个                句,请你展开想象,再写一个描写人们在漓江游玩的句子。

                                                                                                                                                      

6.读了这篇短文,再想想我们学过的《桂林山水》中的漓江,请你写几句赞美漓江的话语。