下列有关信息的描述正确的是( )A．计算机是一种信息处理机B．信息处理只包括加工和

I/O系统主要有三种方式来与主机交换数据，其中主要用软件方法来实现，CPU的效率低的是 (1) ；要有硬件和软件两部分来实现，它利用专门的电路向CPU中的控制器发出 I/O服务请求，控制器则 (2) 转入执行相应的服务程序的是 (3) ；主要由硬件来实现，此时高速外设和内存之间进行数据交换 (4) 的是 (5) 。供选择的答案

4（）

A．通过CPU的控制，利用系统总线

B．不通过CPU的控制，利用系统总线

C．通过CPU的控制，不利用系统总线

D．不通过CPU的控制，不利用系统总线

For those who make journeys across the world, the speed of travel today has turned the countries into a series of villages. Distances between them appear no greater to a modern traveler than those which once faced men as they walked from village to village. Jet planes fly people from one end of the earth to the other, allowing them a freedom of movement undreamt of a hundred years ago.

Yet some people wonder if the revolution in travel has gone too far. A price has been paid, they say, for the conquest (征服) of time and distance. Travel is something to be enjoyed, not endured (忍受). The boat offers leisure and time enough to appreciate the ever-changing sights and sounds of a journey. A journey by train also has a special charm about it. Lakes and forests and wild, open plains sweeping past your carriage window create a grand view in which time and distance mean nothing. On board a plane, however, there is just the blank blue of the sky filling the narrow windows of the airplane. The soft lighting, in-flight films and gentle music make up the only world you know, and the hours progress slowly.

Then there is the time spent being ‘processed’ at a modern airport. People are conveyed like robots along walkways; baggage is weighed, tickets produced, examined and produced yet again before the passengers move to another waiting area. Journeys by rail and sea take longer, yes, but the hours devoted to being ‘processed’ at departure and arrival in airports are luckily absent. No wonder, then, that the modern high-speed trains are winning back passengers from the airlines.

Man, however, is now a world traveler and cannot turn his back on the airplane. The working lives of too many people depend upon it; whole new industries have been built around its design and operation. The holiday-maker, too, with limited time to spend, patiently endures the busy airports and the limited space of the flight to gain those extra hours and even days, relaxing in the sun. Speed controls people’s lives; time saved, in work or play, is the important thing—or so we are told. Perhaps those first horsemen, riding free across the wild, open plains, were enjoying a better world than the one we know today. They could travel at will, and the clock was not their master.

小题1: What does the writer try to express in Paragraph 1?

A．Travel by plane has speeded up the growth of villages.

B．Man has been fond of traveling rather than staying in one place.

C．The speed of modern travel has made distances relatively short.

D．The freedom of movement has helped people realize their dreams.小题2:How does the writer support the underlined statement in Paragraph 2?

A．By giving examples.

B．By giving instructions.

C．By analyzing cause and effect.

D．By following the order of time.小题3:According to Paragraph 3, passengers are turning back to modern high-speed trains because ______.

A．they pay less for the tickets

B．they feel safer during the travel

C．they can enjoy higher speed of travel

D．they don’t have to waste time being ‘processed’小题4: What does the last sentence of the passage mean?

A．They could travel with their master.

B．They needed the clock to tell the time.

C．They preferred traveling on horseback.

D．They could enjoy free and relaxing travel.

爆炸变化过程中所放出的热量称为爆炸热，常用炸药的爆炸热约为( )kJ/kg。

A．1000～2500

B．3700～7500

C．8000～12500

D．15000～19500

【说明】 本程序从正文文件text.in中读入一篇英文短文，统计该短文中不同单词及出现次数，并按词典编辑顺序将单词及出现次数输出到正文文件word.out中。 程序用一棵有序二叉树存储这些单词及其出现的次数，边读入边建立，然后中序遍历该二叉树，将遍历经过的二叉树上的结点内容输出。 【函数】 # include ＜stdio.h＞ # include ＜malloc.h＞ # include ＜ctype.h＞ # include ＜string.h＞ # define INF"text.in" # define OUTF "word.our’ typedef struct treenode { char *word; int count; struct treenode *left, *right; } BNODE; int getword(FILE *fpt, char *word) { char c;c=fgetc(tpt); if (c==EOF) return 0; while(!(tolower(c)＞= ’a’ && tolower(c)＜= ’z’)) { c=fgetc(fpt); if (c==EOF) return 0; } /* 跳过单词间的所有非字母字符 */ while(tolower(c)＞= ’a’ && tolower(c)＜= ’z’) { *word++=c; c=fgetc(fpt); 　} *word=’\0’;return 1; } void binary_tree(BNODE **t, char *word) { BNODE *ptr, *p; int compres;p=NULL;(1) ;while (ptr) /* 寻找插入位置 */{ compres=strcmp(word, ptr-＞word);/* 保存当前比较结果 */ if (!compres) {　(2) ; return;} else { p=ptr;ptr=compres＞0 ptr-＞right: ptr-＞left; 　 } } ptr=(BNODE *)malloc(sizeof(BNODE)); ptr-＞left=ptr-＞right=NULL; ptr-＞word=(char *)malloc(strlen(word)+1); strcpy(ptr-＞word, word); (3) ; if (p==NULL) *t=ptr; else if (compres＞0) p-＞right=ptr; else p-＞left=ptr; } void midorder(FILE *fpt, BNODE *t) { if (t==NULL) return; midorder(fpt, (4) ); fprintf(fpt, "%s %d\n", t-＞word, t-＞count); midorder(fpt, t-＞right); } void main() { FILE *fpt; char word[40];BNODE *root=NULL;if ((fpt=fopen(INF, "r"))==NULL){ printf("Can’t open file %s\n", INF); return;}while(getword(fpt, word)==1) binary_tree( (5) );fclose(fpt);fpt=fopen(OUTF, "w");if (fpt==NULL){ printf("Can’t open fife %s\n", OUTF); return;}midorder(fpt, root);fclose(fpt); }

人体维持内环境的相对稳定，对于细胞正常生命活动非常重要。请回答下列问题。

体温相对恒定是保证内环境相对稳定的一个重要前提，体温调节中枢位于（），温度感受器位于（）上。与体温调节直接相关的两种激素是（）和（）