若x-2在实数范围内有意义，则x的取值范围（ ） A．x≥2 B．x≤2 C．x＞2D

系统开发的原型化方法是一种有效的开发方法，以下( )是原型化成形以后才实施的内容。

A．开发工作模型

B．修正和改进模型

C．进行细部说明

D．识别基本需求

现代印度社会中，竟然还有贫富或社会地位差距过大的青年男女因自由恋爱婚姻被家族追杀致 死的现象。你认为其中根本的原因是（　　）

A．分封制的影响

B．种姓制度的影响

C．印度教观念的影响

D．佛教观念的影响

C

With alarming regularity, we read about oil tankers having accidents near land and the terrible consequences of the oil spills （泄露） on people, nature, and the environment．

Millions of dollars have been used in developing special chemicals to help dismiss the spills and to clean up the animals, beaches, and land spoiled by the oil．Unfortunately, when many of these chemicals are used, more damage is caused to the environment, especially to lives in the sea．

Of all of today's environmental disasters, an oil spill may actually be one of the least serious．Although oil is poisonous, it is a natural material．In the end, it breaks down naturally．There are, of course, long-term effects, but it is usually more serious in the short term．

Nature by itself works better than chemical materials, but when there is a spill we demand that governments act immediately with as much hi-tech knowledge as possible．In 1967 the tanker Torrey Canyon sank off the Scilly Isles near the coast of England and spilled 120,000 tones of oil into the ocean．If you go there today, you will find it hard to see any sign that it ever happened．

Governments seem to accept the risk of transporting millions of tons of oil by ship every day so that we can fill up our cars and drive around and cause even more environmental damage．Interestingly, the biggest companies in the world produce cars, and the next biggest supply the gasoline to make them run I

We should be thinking more about reducing our dependency on oil．Governments should be encouraging research into new technologies, such as cars run by solar power （太阳能） , electricity, hydrogen, and so on．Much of this research has, in the past, been held back by the oil, gas, and coal．

If the world's millions of cars were 10% more efficient （高效的）—and the industry could easily produce cars at least twice as efficient ?we would need many fewer tankers crossing the oceans each year．If this happened, the risks of oil spills would be reduced, and the air we breathe would be cleaner and fresher, too．

63．What is the passage mainly talking about?

A．Oil spills pollution．    B．What oil pollution is．

C．Oil tanker accidents.             D．How to reduce oil pollution.

64．How does the author support the idea that oil spills are not as serious as people believe?

A．By giving a description．   B．By making an argument．

C．By giving an example．          D．By drawing a diagram．

65．What does the underlined word "risk" in Paragraph 5 refer to?

A．Transportation depending more on oil．

B．Poisonous oil breaking down naturally．

C．Millions of tons of oil spilling into the sea．

D．More environmental damage being caused．

66．Which suggestion, is made for reducing oil tank accidents according to the passage?

A．We should build safer tankers in the near future．

B．We should develop new technologies to cut oil use．

C．Tankers should not be allowed to sail near the coastlines．

D．Countries should build more oil pipelines under the sea．

计算题：某生产商通过统计分析得：需求函数Q=1000－4P成本函数C=6000＋50Q如果公司以利润最大化为定价目标，则其价格为多少时可取得最大利润？最大利润是多少？

已知在IN.DAT文件中存有若干个(＜200)四位数字的正整数，函数ReadDat()读取这若干个正整数并存入数组xx中。请编写函数CalValue()，其功能是：(1)求出文件中的正整数个数totNum；(2)求这些数中的各位数字之和是奇数的个数totCnt，以及满足此条件的这些数的算术平均值totPjz，最后调用函数writeDat()把所求的数的结果输出到OUTDAT文件中。
注意：部分源程序已经给出。
请勿改动主函数main()、读函数ReadDat()和写函数writeDat()的内容。
#include＜stdio.h＞
#include＜conio.h＞
#define MAXNUM 200
int xx[MAXNUM];
int totNum=0; /*IN.DAT文件中的正整数个数*/
int totCnt=0; /*符合条件的正整数个数*/
double totPjz=0.0; /*平均值*/
int ReadDat(void);
void writeDat(void);
void CalValue(void)


void main()

int i;
for(i=0; i＜MAXNUM; i++)
xx[i]=0;
if(ReadDat())

printf("数据文件IN.DAT不能打开!\007\n");
return;

CalValue();
printf("IN.DAT文件中的正整数个数=%d个\n",totNum);
printf("符合条件的正整数个数=%d个\n",totCnt);
printf("平均值=%.2f\n",totPjz);
writeDat();

int ReadDat(void)

FILE *fp;
int i=0;
if((fp=fopen("IN.DAT","r"))==NULL)
return 1;
while(!feof(fp))
fscanf(fp,"%d,",＆xx[i++]);
fclose(fp);
return 0;

void writeDat(void)

FILE *fp;
fp=fopen("OUT.DAT","w");
fprintf(fp,"%d\n%d\n%6.2f\n",totNum,totCnt,totPjz);
fclose(fp);