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下图所示的传动系统图，主轴可以有()种转速。
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Task 2
Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45.
Most nations of the world export goods to other countries. Likewise, many import goods from other nations. Why do countries engage in international trade？
Firstly, some countries of the world have certain conditions that provide them with a basis for international trade. For example, Columbia and Brazil have just the right climate for growing coffee. They export the surplus to earn foreign exchange to pay for the goods they import.
Secondly, if a country has an abundance(充裕) of natural resources, it generally exports some of them. Rubber from Malaysia and oil from the Middle East countries are examples.
Thirdly, if a nation is advanced in science and technology, it can produce sophisticated(精密的) machinery and equipment, such as computers, jet airplanes and electric generators (g(发电机). Their manufactured goods are usually sold at high prices in the international market. So they enjoy favorable conditions in the international trade.
In addition to trade in goods, there is another form. of trade, i.e. trade in service. The former is called visible trade, and the' latter, invisible trade. Transportation, insurance, financing and tourism are some of the forms of invisible trade. Trade in these forms can be as important to some nations as the exchange of goods is to others.
The word "surplus" in the last sentence of Para.2 means
听力原文：Q: How much is the rent a month？
(14)
A．To go to the school dining hall with the girl.B．To eat the sandwich his mother has m
听力原文：M: Was it very cold here last winter？
W: Not really. The temperature never dropped below freezing. There was a little snow in December around Christmas time.
Q: What did the woman say about the weather？
(2)
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