破伤风的潜伏期通常为（） A.1～5天 B.6～12天 C.1个月 D.2～3个月

新型隐球菌具有诊断价值的形态特点是

A．有假菌丝

B．形成厚膜孢子

C．有异染颗粒

D．菌体外有一层肥厚的荚膜

E．在菌体次极端，有直径大于菌体的芽胞

火星的半径是地球半径的一半，火星的质量约为地球质量的，那么在地球上50kg的人，如果在火星上质量是___________kg，火星表面的重力加速度为___________m/s²，此人在火星上体重为___________N。（取g＝9.8m/s²）

信号设备防雷地线不得与（）的防雷地线合用。

　Without proper planning, tourism can cause problems. For example, too many tourists can crowd public places that are also enjoyed by the inhabitants of a country. If tourists create too much traffic, the inhabitants become annoyed and unhappy. They begin to dislike tourists and to treat them impolitely. They forget how much tourism can help the country’s economy. It is important to think about the people of a destination country and how tourism affects them. Tourism should help a country, keep the customs and beauty that attract tourists. Tourism should also advance the wealth and happiness of local inhabitants.

　　Too much tourism can be a problem. If tourism grows too quickly, people must leave other jobs to work in the tourism industry. This means that other parts of the country’s economy can suffer.

　　On the other hand, if there is not enough tourism, people can lose jobs. Businesses can also lose money. It costs a great deal of money to build large hotels, airports, air terminals, first- class roads, and other support facilities（配套设施）needed by tourist attractions. For example, a major international class tourism hotel can cost as much as 50 thousand dollars per room to build. If this room is not used most of the time, the owners of the hotel lose money.

　　Building a hotel is just a beginning. There must be many support facilities as well, including roads to get to the hotel, electricity, sewers to handle waste, and water. All of these support facilities cost money. If they are not used because there are not enough tourists , jobs and money are lost.

　小题1:Which of the following do you think has been discussed in the part before this selection？

A．It is extremely important to develop tourism.

B．Building roads and hotels is essential.

C．Support facilities are highly necessary.

D．Planning is of great importance to tourism.　小题2:The underlined word“ inhabitants” （in Paragraph 1 ） probably means________.

A．tourists

B．passengers

C．population

D．citizens　小题3:Too much tourism can cause all these problems EXCEPT ________ .

A．a bad effect on other industries

B．a change of tourists’ customs

C．over - crowdedness of places of interest

D．pressure on traffic　小题4:It can be inferred from the text that ________ .

A．the author doesn’t like tourism developing so fast

B．local people will benefit from tourist attraction

C．other parts of a country’s economy won’t benefit from tourism much

D．we can't build too many support facilities

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