完形填空。（10分）

Life in the 21st century will be different from that in the 20th century, because many changes      in the new century,        what will the changes be?

First, the population is growing very fast. There        more and more people in the world and most of them will live longer than before. Computers will be        smaller and more useful, and there will be        one in every home. And computer studies will be one of the most important        in schools.

Second, people will work fewer hours than they did in the 20th century, and they’ll have more free time for sports,        TV and traveling. Traveling will be even cheaper and easier. And more people will go to       countries for holidays.

Third, there will be changes in our food, too. People will use more land        new towns and houses. Then there will be less room for cows and sheep, so meat will be more expensive. Maybe no one will eat it every day, instead, they will eat more vegetables and fruit. Maybe people will be healthier.

Last, work in the future will be       , too. Robots will do the dangerous and hard work. Because of this, many people won’t have enough work to do. This will be a problem.

小题1:A.take place        B. will happen   C. have taken place

小题2:A.but           B.and             C. so     

小题3:A.will be       B. will have      C. are    

小题4:A.very          B. quite          C. much       

小题5:A.at least      B. at most            C. more than      

小题6:A.classes       B. lessons            C.subjects

小题7:A.watch         B. watching          C. seeing

小题8:A.another       B. the other          C. other      

小题9:A. to build         B. build          C. for build  

小题10:A.dangerous     B. difficult          C. different 

已知数据文件in33.dat中存有300个4位数，并已调用函数readDat()把这些数存人数组a中，请编制一函数jsValue()，其功能是：求出个位数上的数减千位数上的数减百位数上的数减十位数上的数大于0的个数cnt，再求出所有满足此条件的4位数的平均值pjz1，以及所有不满足此条件的4位数的平均值pjz2，最后调用函数writeDat()把结果cnt、pjz1、pjz2输出到out33.dat文件中。
例如：1239，9-1-2-3＞0，则该数满足条件，计算平均值pjz1，且个数cnt=cnt+1；8129，9-8-1-2＜0，则该数不满足条件，计算平均值pjz2。
注意：部分源程序已给出。
程序中已定义数组：a[300]，b[300]，已定义变量：cnt，pjz1，pjz2。
请勿改动主函数main()、读函数readDat()和写函数writeDat()的内容。
[试题程序]
#include＜stdio.h＞
int a[300],cnt=0;
double pjz1=0.0,pjz2=0.0;
void readDat();
void writeDat();
void jsValue()


voidmain()

readDat();
jsValue();
writeDat();
printf("cnt=%d\n满足条件的平均值pjz1=%7.2lf\n不满足条件的平均值pjz2=%7.2lf\n",cnt,pjz1,pjz2);

void readDat()

FILEfp;
int i;
fp=fopen("in33．dat","r");
for(i=0;i＜300;i++)
fscanf(fp,"%d,",&a[i]);
fclose(fp);

void writeDat()

FILE%fp;
fp=fopen("out33．dat","w");
fprintf(fp,"%d kn%7.21f kn%7．21f\n",cnt,pjz1,pjz2);
fclose(fP);