在进行产品功能价值分析时，若甲、乙、丙、丁四个部件的价值系数分别为V甲=0.6，V乙

单独接触不致癌，在接触启动剂之后反复接触可增强致癌作用的是（）。

A．促癌剂

B．启动剂

C．助癌剂

D．免疫抑制剂

E．过氧化物酶体增殖剂

阅读理解

     Fear and its companion pain are two of the most useful things that men and animals possess,if they

are properly used. If fire did not hurt when it burnt, children would play it until their hands were bumt

away. Similarly , if pain existed but fear did not,a child would bum itself again and again , because fear

would not warn the child to keep away from the fire that had burnt him or her before. A really fearless

soldier-and some do exist-is not a good soldier because he is soon killed;and a dead soldier is of no use

to his army. Fear and pain are therefore two guards without which men and animals might soon die out.

     In our first sentence we suggested that fear ought to be properly used. If, for example ,you  never go

out of your house  because  of the danger of being knocked down and killed in the street by a car, you

are letting fear rule you too much. Even in your house you are not absolutely safe:a plane may crash on

your house, or ants may eat away some of the wood in your roof , and they later may fall on you , or

you may get cancer!

     The important thing is not to let fear rule you , but instead to use fear as your servant and guide. Fear

will warn you of dangers; then you have to decide what action to take.

     In many cases, you can take quick and successful action to avoid the danger. For example , you see

a car coming straight towards you ; fear warns  you , you jump  out of  the  way , and  all  is  OK.

     In some cases, however, you decide that there is nothing that you can do to avoid the danger. For

example, you cannot prevent a plane from crashing into your house , and you may not want to go and

live in a desert where there are no plants. In this case , fear has given you its waming;you have examined

it and decided on your course of action,so fear of this particular danger is no longer of any use to you ,

and you have to try to overcome it.

1. Children would play with fire until their hands were burnt away if_______. 

A. they were given no warning beforehand

B. they didn't have any sense ofpain at all

C. they had never burnt themselves

D. they felt afraid of the fire

2. A really fearless soldier_________.    

A. is of a little use to his army

B. is not afraid of battles at all

C. is nothing but a dead soldier

D. is easy to get killed in a battle

3. People sometimes succeed in timely avoiding dangers because________.   

A. they are warned of the danger and take quick action

B. they are quick both in mind and in action

C. they are calm in face of danger

D. they have gained much experience

4. It is implied but not stated that________.  

A. fear is always something helpful

B. too much fear is harmful

C. fear should be used as a servant and guide

D. fear is something strange and particular

具有2区或22区爆炸危险环境的建筑物按防雷要求属于（）类。

A.一

B.二

C.三

D.四

进行交通行政当场处罚应注意哪些问题？