问题 单项选择题

下列各项中属于化学致癌因子的是:()

A.电离辐射

B.X射线

C.紫外线

D.苯

答案

参考答案:D

解析:致癌因子包括物理致癌因子、化学致癌因子和病毒致癌因子,其中化学致癌因子是引起癌变的化学物质,故D正确;电离辐射、X射线、紫外线都属于物理致癌因子,故ABC均错。考点:本题主要考查引起癌变的因素,意在考查考生能熟记生物学基本知识的能力。

综合
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     Australia has passed regulations that will enable more international students to further their education

in the country.    

     The new measures were released by the Australian Department of Tertiary Education, Skills, Jobs

and Workplace Relations in September and will take effect in mid-2012.    

     As a result, the student visa application process for overseas students has been simplified, and the

deposit (押金) required to study in Australia has been reduced. Language requirements for overseas

students have also been eased.    

     Also, overseas students receiving a higher education in Australia will be granted a working visa lasting

from two to four years after graduation, as long as they meet the basic IELTS requirement.    

     "This change will definitely make Australia a more attractive destination for Chinese students planning

to study overseas," says Wang Lan, a consultant from Education International Cooperation Group (EIC),

a Beijing-based company that provides services to students wishing to study overseas.    

     However, in the past few years, many of Wang's student clients (客户) could not start studies in

Australia because they did not meet the language requirements, visa processing took a long time and

deposit regulations were tough. The change in policy is good news for the parents of students wishing to

study in Australia, Wang says.    

     A 22-year-old female student surnamed Li, in Beijing, who is planning to do her  postgraduate studies

in Australia, learned about the policy change several weeks ago.   

     "According to the previous deposit requirement for my student visa, my family was required to put

down 550,000 yuan ($86,850). Now we only need to prepare 410,000 yuan. This is a relief for my

parents," Li says.

    She also says that the two to four years working visa makes her feel much clearer about her study

plans.    

     "I believe several years of working experience abroad will strengthen my competitiveness when I

return to China," she says.    

    Gaining a competitive advantage is the major reason for Chinese students to study abroad, according

to the report by EIC.

1. What's the main idea of the passage?  

A. Language requirement for overseas students have been eased in Australia.

B. Australia is a most attractive place for students in China.

C. Australia widens window of opportunity for international students.

D. More students will work in Australia after their graduation.

2. Which of the following is NOT the content of the new regulations?  

A. The student visa application process for overseas students has been simplified.

B. The deposit required to study in Australia has been reduced.

C. Language requirements for overseas students have been more difficult.

D. After graduation, some overseas students can get a working visa in Australia.

3. After the new regulations are passed, _______ .   

A. more students will come to Australia to work

B. more Chinese students will choose to live in Australia.

C. the opportunities to work in Australia decrease for overseas students

D. more Chinese students will choose to further their education in Australia

4. How much can Li's parents save according to the new regulations?  

A. 550,000 yuan

B. 140,000 yuan

C. 410,000 yuan

D. 86,850 yuan

5. Why do many students want to work in Australia after their graduation?   

A. The working experience abroad will strengthen their competitiveness.

B. They can earn more money in Australia.

C. Their working experience can make them stay in Australia forever.

D. They have to do so according to the new regulations.