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问题 选择题

He _____ in the classroom just now. he _____ be there now. [ ]

A. heard to sing, may

B. was heard sing, must

C. heard sing, must

D. was heard to sing, may

答案

答案：D

选择题

下列说法中正确的是（　　）

A．质点就是体积很小的物体

B．只有做直线运动的物体才能看成质点

C．在单方向直线运动中，位移就是路程

D．位移是矢量，路程是标量；有大小又有方向的物理量不一定是矢量
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多项选择题

已知C源程序如下：
#include＜stdio.h＞
#include＜string.h＞
void reverse (char s[])
int c,i,j;
for(i=0,j=strlen(s)-1;i＜j;i++,j++)
c:s [i];
s[i]=s[j];
s [j]=c;


void getHex(int number,char s[])
int I;
i=0;
while (number＞0)
if(number%16＜10)
s [i++] =number%1 6+’0’;
else
switch (number%16)
case 10:s[i++]=’A’; break;
case 11:s[i++]=’B’; break;
case 12:s[i++]=’C’; break;
case 13:s[i++]=’D’; break;
case 14:s[i++]=’E’; break;
case 15:s[i++]=’F’; break;
default: printf("Error");break;

number/=16;

s[i]=’\0’;
reverse (s);

int main()
unsigned int number;
int i=0;
char s[50] ;
printf ("%s", "please input number:\n");
scanf ("%d", ＆number);
getHex (number, s);
i=0;
while (s [i])
printf("%c",s[i++]);
return 0;

画出程序中所有函数的控制流程图。
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