問題4　次の言葉の使い方として最もよいものを、1 2 3 4から一つ選びなさい。ほど

尿素（H₂NCONH₂）是一种非常重要的高氮化肥，工业上合成尿素的反应如下：2NH₃(l)＋CO₂(g)H₂O(l)＋H₂NCONH₂(l)  △H＝－103.7 kJ·mol^－1

试回答下列问题：

（1）下列措施中有利于提高尿素的产率的是__________。

A．采用高温        B．采用高压        C．寻找更高效的催化剂

（2）合成尿素的反应在进行时分为如下两步：

第一步：2NH₃(l)＋CO₂(g)H₂NCOONH₄(l) (氨基甲酸铵)  △H1

第二步：H₂NCOONH₄(l)H₂O(l)＋H₂NCONH₂(l)    △H2

某实验小组模拟工业上合成尿素的条件，在一体积为0.5 L密闭容器中投入4 mol氨和1mol二氧化碳，实验测得反应中各组分随时间的变化如下图Ⅰ所示：

①已知总反应的快慢由慢的一步决定，则合成尿素总反应的快慢由第_______步反应决定，总反应进行到 _______ min时到达平衡。

②反应进行到10 min时测得CO₂的物质的量如图所示，则用CO₂表示的第一步反应的速率v(CO₂)＝_________ 。

③第二步反应的平衡常数K随温度的变化如上右图Ⅱ所示，则△H2 ________0（填“＞”“＜”或“＝”）

④第一步反应的△S ________0（填“＞”、“＜”或，“＝”），在________（填“较高”或“较低”）温度下有利于该反应自发进行。

设一元二次方程x²-7x+3=0的两个实数根分别为x₁和x₂，则x₁+x₂=______，x₁x₂=______．

以下程序中函数fun的功能是：构成一个如图所示的带头节点的单向链表，在节点的数据域中放入了具有两个字符的字符串。函数disp的功能是显示输出该单链表中所有节点中的字符串。请填空完成函数disp。

#include＜stdio.h＞
typedef struct node/*链表节点结构*/
char sub[3]；
struct node*next；
Node；
Node fun(char s)/*建立链表*/
…
void disp(Node*h)
Node*p；
p=h-＞next;
while______
printf("%s\n"，p-＞sub)；
p=p-＞next；

main()
Node*hd；
hd=fun()；
disp(hd)；
printf("\n")；

Some people believe that international sports create goodwill between the nations and that if countries play games together they will learn to live together. Others say that the opposite is true: that international competitions encourage false national pride and lead to misunderstanding and hatred. There is probably some truth in both arguments, but in recent years the Olympic Games have done little to support the view that sports encourage international brotherhood. Not only was there the tragic incident involving the murder of athletes, but the Games were also ruined by lesser incidents caused mainly by minor national competitions.

　One country received its second-place medals with visible indignation（愤慨）after a hockey final. There had been noisy scenes at the end of the hockey match, the loser’s objection to the final decision. They were sure that one of their goals should not have been disallowed and that their opponents’ victory was unfair. Their manager was very angry and he said, “This wasn’t hockey. Hockey and the International Hockey Federation are finished.” The president of the Federation said later that such behavior could result in the suspension（停赛）of the team for at least three years.

　The American basketball team announced that they would not give up the first place to Russia, after a disputable end to their competition. The game had ended in disturbance. It was thought at first that the United States had won, by a single point, but it was announced that there were three seconds still to play. A Russian player popped the ball into the basket. It was the first time the USA had ever lost an Olympic basketball match. An appeal jury discussed the matter for four and a half hours before announcing that the result would stand. The American players then voted not to receive the silver medals.

　Incidents of this kind will continue as long as sports are played competitively rather than for the love of the game. The suggestion that athletes should compete as individuals, or in non-national teams, might be too much to hope for. But in the present organization of the Olympics there is far too much that encourages aggressive patriotism（爱国主义）.

小题1:According to the author, recent Olympic Games have ________.

A．caused national pride for athletes

B．created goodwill between the nations

C．hardly showed any international friendship

D．led to less misunderstanding between countries小题2:What did the manager mean by saying “Hockey and the International Hockey Federation are finished”?

A．His team would no longer take part in international games.

B．There should be no hockey matches organized by the Federation.

C．Hockey and the Federation are both ruined by the unfair decisions.

D．The International Hockey Federation should be dismissed forever.小题3:By taking the basketball game for example, the author wants to prove that ________.

A．too much patriotism was displayed in the games

B．the announcement to prolong the match was wrong

C．the appeal jury was too hesitant in making the decision

D．the team was right in refusing to accept the silver medals小题4:What conclusion can be drawn from the passage?

A．Sports should be played for the love of one’s nation.

B．Unfair decisions are common in the Olympic Games.

C．International competitions will lead to misunderstanding.

D．The organization for the Olympic Games must be reformed.

全淹没灭火系统二氧化碳的喷放时间不应大于（）。当扑救固体深位火灾时，喷放时间不应大于（），并应在前（）内使二氧化碳的浓度达到30%。