问题 选择题

对下列现象的分析,正确的是(  )

A.冬天用暖手袋暖手,是通过做功的方式改变内能

B.热机在压缩冲程中把内能转化成机械能

C.扫地时“尘土飞扬”,是由分子做无规则运动引起的

D.汽车发动机用水做冷却物质,是因为水的比热容比较大

答案

A、用暖手袋暖手,是通过热传递的方式改变内能,不符合题意;

B、在压缩冲程中把机械能转化成内能,不符合题意;

C、“尘土飞扬”是细小的沙尘颗粒在运动,不是分子的运动,不符合题意;

D、因为水的比热容比较大,同样情况下可以吸收更多的热量,所以汽车发动机常用水做冷却物质,符合题意;

故选D.

填空题
阅读理解

When many people in the west think of China, the animal that they think of is the dragon. For them, the dragon is an aggressive monster that breathes fire. Many popular legends tell how dragons have killed brave knights and eaten beautiful young girls.

For Chinese people, however, the dragon is not an evil monster. It’s a cultural and spiritual symbol for prosperity and good luck. The dragon’s main task is to create harmony and bring rain. Dragons are celebrated in art and architecture, and of course the dragon dance is a very popular ritual (仪式).

China isn’t the only country to have the dragon as its symbol. Wales in the UK, has a red dragon proudly displayed on its flag. Another country in the world with a dragon on its flag is Bhutan, a tiny country between China and India.

Almost all countries in the world have an animal symbol representing their countries. This is particularly obvious during sports. The English think lions to be brave and proud animal and the English football teams have three lions on their football shirts.

Australia is famous for kangaroos, of course. The national rugby team is more commonly known as the Wallabies, a type of small kangaroo.The South African team is known as the Springboks, a type of African antelope. Likewise the New Zealanders, whether playing sports or not, are commonly known as kiwis. A kiwi is a native New Zealand bird that can’t fly.

All countries are proud of their symbols, which they feel reflect national characteristics or the beauty and variety of their natural environments. Recently, a Shang hai professor claimed that using the dragon as a national symbol could make western countries have a negative view of China. But in an Internet survey 90% of Chinese people wanted to keep the dragon.

小题1:In the opinion of the west, the dragon is ______.

A.a terrible animal that is not popular

B.a cultural and spiritual symbol of good luck

C.a reflection of China’s national characteristics

D.an animal that can create harmony and bring rain小题2:Which of the following does NOT use the dragon as its national symbol?

A.China.

B.Wales.

C.Bhutan.

D.India.小题3:According to the passage, which of the following statements is TRUE?

A.The national rugby team from the South Africa is well known as the Wallabies.

B.The Australian team is known as Springboks, a type of kangaroo.

C.The New Zealanders are commonly known as kiwis only when playing sports.

D.The dragon is mentioned to have been used on the flag in two countries.