下列物质的用途主要是由化学性质决定的是( ) ①用氢气冶炼单晶硅②用石墨做干电

A公司该年度的捐赠扣除限额标准为( )。

A．年度销售收人总额的12%

B．年度销售收入总额的10%

C．年度利润总额的12%

D．年度利润总额的10%

阅读理解。

     Most young people enjoy some form of physical activity.It may be walking, cycling, swimming, or in

winter, skating or skiing. It may be a game of some form-football, basketball,hockey, golf or tennis. It

may be mountaineering.

      Those who have a passion ( strong emotion) for climbing high mountains are often looked upon with

astonishment. Why are men and women willing to suffer cold and hardship,and to take risks in high

mountains? This astonishment is caused, probably, by the differences between mountaineering and other

forms of activities.

     Mountaineering is a sport and not a game. There are no man- made  rules as others ,such as golf and

football. There are ,of course , rules of different kinds which it would be dangerous to ignore,but it is this

freedom from man-made rules that makes mountaineering at- tractive to many people. Those who climb

mountains are free to use their own methods.

     If we compare mountaineering with other more familiar sports, we might think that one big difference

is that mountaineering is not a" team  game " . There  are ,it  is  true , no " matches " between " teams"

of climbers,but when climbers are on a rock linked by a rope on which their lives may depend,there is

obviously teamwork.

      A mountain climber knows that he may have to fight forces that are stronger and more powerful than

man. He has to fight the forces of nature. His sport requires high mental and physical qualities.

    A mountain climber continues to improve in skill year after year. A skier is probably past it by the age

of thirty,but it is not unusual for men of fifty or sixty to climb the highest mountain in the Alps. They may

take more time than younger men,but they perhaps climb with more skills and less waste of effort,and

they certainly experience equal enjoyment.

1. What movements are popular among people in winter in the passage?

A. Soccer and golf.              

B. Skiing and skating.

C. Cycling and hockey.        

D. Mountaineering.

 2. Mountaineering is a sport,not a game,because _____  . 

A. it has man-made rules

B. it is too dangerous for climbers

C. it can't bring people joy and leisure

D. it is free for climbers to use their own methods

3. According to the passage, which of the following statements is TRUE?   

A. Mountaineering is a match between climbers.

B. Mountaineering is similar to other sports in many ways.

C. Climbers work like a team when their lives may depend on a rope.

D. Climbers help each other in time of difficulty.

4. It can be inferred from the passage that____.   

A. mountaineering has no appeal to people

B. physical quality is more important than mental quality for climbers

C. a mountain climber would pass it by the age of thirty

D. it is possible for an old man of fifty or sixty to climb the Alps

时间数列中，指标数值是通过一次登记取得的数列是（）

A.相对数时间数列

B.绝对数时间数列

C.时期数列

D.时点数列

根据《治安管理处罚法》规定，在什么情况下人民警察可以当场收缴罚款？