禁止使用氟里昂作为制冷剂的目的是为了保护大气圈的______层。

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答案

参考答案：臭氧

补全对话，情景问答

A: Hello! Tom, where are you going?
B;        1
A: A concert?       2
B: The Twins band. A: Wonderful! It is my favorite band.         3
B: In Guangming theatre, at 7P.M. this afternoon.
A:       4
B: To raise some money for the students in poor area. Would you like to go with me?
A: I’d love to, but I have no tickets.
B: Don’t worry, I can give you one.
A:       5       . Let’s go!

A. What was the concert for?
B. How do like the concert?
C. Who will give a concert?
D. It’s very kind of you
E. I’m going to a concert?
F. It’s my pleasure
G. Where and when will they give the concert?

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填空题

下列给定程序中，函数fun的功能是：计算N×N矩阵的主对角线元素和反向对角线元素之和，并作为函数值返回。要求先累加主对角线元素中的值，再累加反向对角线元素中的值。
请在下划线处填入正确的内容并将下划线删除，使程序得出正确的结果。
注意：部分源程序给出如下。
不得增行或删行，也不得更改程序的结构!
试题程序：
#include＜stdio.h＞
#define N 4
fun(int t[][N], int n)

int i, sum;
/******************found*******************/
(1) ;
for(i=0; i＜n; i++)
/******************found*******************/
sum+= (2) ;
for(i=0; i＜n; i++)

/水半丰拳术水术枣木车术木木水丰半术fbund木木木水串术半半术术术半术丰木丰年，

sum+=t[i][n-i- (3) ;
return sum;

main()

int t[][N]=21, 2, 13, 24, 25, 16, 47, 38, 29, 11, 32, 54, 42, 21, 3, 10, i, j;
printf("\nThe original data:\n");
for(i=0; i＜N; i++)

for(j=0; j＜N; j++)
printf("%4d", t[i][j]);
printf("\n");
printf("The result is:%d", fun(t, N));

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