严格定义的方法是在一定假设的前提下形成的，它认为系统的所有需求都能被 【20】 。

根据短文内容，选择正确答案。

      Mr. and Mrs. Green come from Australia. They are in Beijing now. Mr. Green is a teacher in a high school.

He teaches English. He likes reading and running. He isn't good at cooking. His son, Jim, is a student. He is on

the school football team. He likes playing football very much. He is the best football player in his class. He likes

school, too. He does his homework every day. Mrs. Green is a teacher, too. She can speak a little Chinese. She

likes Chinese food. She doesn't like doing housework at all, but she likes cooking. They all like China a lot.

1. Mr. and Mrs. Green are ______________.

A. Japanese

B. American

C. Australian

D. English

2. ______________ doesn't do well in cooking.

A. They

B. Tom

C. Mrs. Green

D. Mr. Green

3. ______________ can speak a little Chinese.

A. They

B. Tom

C. Mrs. Green

D. Mr. Green

4. Mrs. Green doesn't like ______________ at all.

A. Chinese food

B. teaching

C. doing housework

D. cooking

5. They all like ______________ very much.

A. China

B. Chinese food

C. playing

D. school

阅读理解

     Did you feel it was warmer than before ? There have been warm winter in China since 1986, said scientists.

     China  needs to take quick action to cut carbon dioxide (二氧化碳)           emission(排放)because it's the main reason for global(全球)warming. The    good news is that China has seen the importance of going green .Can you       slow glogal warming ? Sure ! You and your family can take steps to cut the   amount   of carbon dioxide we send out into the air .Here are some pieces of advice to help save the earth. 

     Wear used clothes. Wearing your brother's, sister's or dad's old T-shirt      means you save the energy(能源). Change your light bulbs(灯泡). Use           energy-saving light bulbs. And don't forget to turn off the lights when you      leave a room and turn off your television and computer when they are not in use! Ride the bus. Taking a bus saves a lot of oil every year. Say no to plastic bags. The next time your parents go to the market, ask them to use baskets.   Open a window. Don't use the air conditioner, and let some fresh air in.       When you have to use the conditioner, set the temperature higher in the          summer and lower in the winter to save energy. Make small changes in your  daily life. Don't use paper cups, bags and boxes. It's time for all of us to do    something to save the earth.

1. The main reason for global warming is ___________.

A. the oil

B. carbon dioxide

C. paper cups, bags and boxes

D. televisions and computers

2. The word "amount" in the second paragraph means "__________".

A. 体积

B. 面积

C. 总量      

D. 重量

3. How many pieces of advice are there in this passage?

A. Three.

B. Four.

C. Five.

D. Six.

4. Which of the following is TRUE?

A. It's a pity(可怜)to wear your dad's old T-shirt.

B. Using air conditioners may be a waste of energy.

C. Taking a bus wastes a lot of oil every year.

D. Using paper bags saves energy a lot

5. The passage is mainly about the ways to _______.

A. slow down global warming        

B. make energy

C. change our daily life          

D. change the world weather

运用整体与部分及部分与部分之间的数量关系进行的构成称为（）

A.分割构成

B.比例构成

C.变异构成

D.对比构成

任何金融投资行为都存在一定的风险，这是毋庸置疑的，只是风险的大小不同而已。想要找到没有任何风险的金融投资项目几乎是不可能的，但是，不能因此认为，风险既然难以避免，因而就无所谓。实际情况是减小、锁住乃至规避风险，或者较小的风险获取较大的投资回报，是有一定的规律性或者可在一定程度上把握的。
这段文字主要说明( )。

A．人们对金融投资风险的认识是逐步加深的

B．研究者的心态是控制金融投资风险的制约因素

C．现实生活中人们往往会夸大金融投资的风险

D．金融投资虽然有风险，但还是能够掌握的

（）是专门窃取用户隐私资料的病毒，通过网络进行传播，一旦中毒，用户电脑会被监控，一举一动都被别人尽收眼底。

A.蠕虫病毒

B.宏病毒

C.CIH病毒

D.木马病毒