有关的技术分析著作常将缺口划分为普通缺口、突破缺口、持续性缺口和消耗性缺口四种形态。

已知命题p：若x>0且y>0，则xy>0，则p的否命题是(　　)

A．若x>0且y>0，则xy≤0

B．若x≤0且y≤0，则xy≤0

C．若x，y至少有一个不大于0，则xy<0

D．若x，y至少有一个小于或等于0，则xy≤0

下列关于煮罐法的操作中，不正确的是：（）

A.选用无裂隙的竹罐

B.将罐置入药液中加热

C.用镊子夹住罐口提出水面

D.迅速用湿冷毛巾紧扪罐口

E.趁热将罐扣在所拔部位

     Two college students were returning home from their part time work at 12: 30 p. m. on Saturday,

December 28, 1985 ____1____  they saw an object shoot across the sky at Dyserth Crossroads in the

Denbighshire village.

     The object appeared to have a yellow glow at its centre with green light.The students said it was

traveling  ____2____  great speed from the direction of Meliden Quarry towards fields. After some miles

the object stopped, circled and disappeared behind ____3____ cloud. The students stopped at the

scene of the landing and investigated further. ____4____  they could see nothing.

     A week  ____5____   at 8: 30 p. m. on January 4, 1986, in the neighbouring village of Trelawnyd

four people claimed  ____6____  have seen a cigarshaped craft with bright red lights. Earlier on the

same day a farmer said he saw a bright red round object hanging in the sky  ____7____  trees in the

village. He said ____8____  was some 40 feet from one side to the other.

起动机一般由（）、（）和（）三部分组成。

请补充函数fun()，该函数的功能是：把数组aa中元素下标为偶数的元素按从小到大重新保存在原数组中，其它元素位置不变。
例如，输入“33，67，42，58，25，76，85，16，41， 56”，则输出“25，67，33，58，41，76，42，16，85，56”。
注意：部分源程序给出如下。
请勿改动主函数main和其他函数中的任何内容，仅在函数fun()的横线上填入所编写的若干表达式或语句。
试题程序：
# include＜stdio. h＞
#define N 10
void fun(int aa[])

int i, j, t;
for (i=0; i＜N;i=i+2)

for( 【1】 ; j＜N; j=j+2)
if ( 【2】 )

t=aa [j];
aa [j] =aa [i];
aa [i] =t;



main ()

int i;
int aa[N]=33, 67,42, 58, 25, 76, 85, 16,41, 56;
clrscr ();
printf("\n*** original list ***\n");
for(i=0; i＜N; i++)
printf ("%4d", aa [i] );
fun (aa);
printf("\n*** new list ***\n");
for(i=0; i＜N; i++)
printf ("%4d", aa [i] );