信号传递原则是引导原则的延伸。信号传递原则要求根据公司的行为判断它未来的收益。

Today there are 6.4 billion people on the earth. By the year 2050 there may be 12.5 billion . There are a lot of people to feed. We need more  and more food.

One way to produce more food is growing stronger plants. For thousands of years, farmers have made plants better. Every season, they pick the best plants for the next season. It works very slowly. Since 1983, scientists have been able to change plants more quickly by changing their genetic（遗传的） material. Foods from plants grown in this way are called genetically modified(改变的) foods, or GM foods.

By changing the genetic material of a plant, it is possible to make new plants. They make plants which are strong against plant diseases. They can also help in our diseases; a kind of rice is being prepared , for example , which stops people becoming blind.

Rich countries produce GM foods because they are easy to grow and bring in more money. Poor countries are interested in them because they help produce more food.

GM plants are not natural. No one knows how good or bad they are,. Making GM foods is only one way of feeding people in 2050. There are strong feelings against them, because they are unnatural. They may feed people , then hurt them or their children later. But both rich and poor countries are interested in their use, and they are not going to go away. In 2050, we may think differently about them.

小题1:GM foods are made by                 

A. farmers            B. workers      C. scientists          D plants

小题2:What are the good things about GM foods  ?

A. They make plants strong against diseases.   B. They are unnatural.

C. They can help in human diseases.            D  Both A and  C.

小题3:GM foods        .

A. are a quick way to produce food    B. grow in the wild 

C. are safe                           D are grown only in rich countries

小题4:Why do some people not like GM foods?

A. They are not useful.       B. They are not helpful.

C. They are not natural.      D  They are not cheap.

小题5:From the passage we know that      .

A．GM foods will disappear one day in the future

B．GM foods will not disappear in the future

C．People will not be interested in GM foods.

D．People will have to stop using GM foods

下列哪项属于遗传性溶血性贫血（）.

A.微血管病性溶血性贫血

B.阵发性睡眠性血红蛋白尿

C.自身免疫性溶血性贫血

D.ABO血型不合所致的溶血性贫血

E.珠蛋白合成障碍性贫血

通过对实验现象的观察、分析推理得出正确的结论是化学学习的方法之一。对下列实验事实解释正确的是 [ ]

我国政府的一切权力都是人民赋予的，必须对人民高度负责，为人民谋利益，接受人民监督。据此回答

1－2题：

1．政府必须自觉接受人民监督的根本原因在于 [ ]

A．我国是人民当家作主的社会主义国家

B．人民代表大会制度是我国的根本政治制度

C．政府是由人民直接选举产生的

D．政府工作人员都是从人民中选拔出来的 

2．某市政府主动出击，请市民评议政府工作。“万人评议政府”活动，增加了干部服务意识，提高了工作效率，推动了社会经济发展。这说明 [ ]

A．只有通过民主评议才能提高干部服务意识，提高效率

B．权利是一把双刃剑

C．民主监督有利于改进国家机关及其工作人员的工作

D．公民具有自觉履行监督国家机关的义务

下列各项，不适用塞因塞用的病症是（）。

A.脾虚腹胀

B.血枯经闭

C.气郁胀满

D.肾虚癃闭

E.阴虚便秘