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【单选题】
In previous times, then fresh meat was in short __________, pigeons were kept by many households as a source of food.
A. store               
B. provision   
C. reserve           
D. supply
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【单选题】
Those gifts of rare books that were given to us were deeply _________.___
A. appreciated     
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C. appealed         
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It is our ___________ policy that we will achieve unity through peaceful means.___
A. consistent         
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He is __________ about his chances of winning a gold medal in the Olympics next year.___
A. optimistic         
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The director was critical _______________ the way we were doing the work.___
A. at             
B. in      
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In a sudden _____________ of anger, the man tore up everything within reach.___
A. attack       
B. burst    
C. split           
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In Britain people _____________ four million tons of potatoes every year.___
A. swallow             
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I'd _____________ his reputation with other farmers and business people in the community, and then make a decision about whether or not to approve a loan.___
A. take into account     
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She cooked the meat for a long time so as to make it _____________ enough to eat.___
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A. certainly               
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A lot of ants are always invading my kitchen. They are a thorough ___________.___
A. nuisance             
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As we can no longer wait for the delivery of our order, we have to _________ it.___
A. postpone           
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C. delay                 
D. cancel
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 When a fire _________ at the National Exhibition in London, at least ten priceless paintings were completely destroyed.___
A. broke of             
B. broke out  
C. broke down       
D. broke up
【单选题】
 The destruction of these treasures was a loss for mankind that no amount of money could __________.___
A. stand up to         
B. make up for
C. come up with     
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 The student was just about to ___________ the questions, when suddenly he found the answer.___
A. arrive at             
B. submit to  
C. work out             
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 When there are small children around, it is necessary to put bottles of pills out of _________.___
A. reach                 
B. hand    
C. hold                   
D. place
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 The _________ of blood always makes him feel sick.___
A. sight                   
B. view   
C. look                   
D. form
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 In Britain, the best season of the year is probably __________ spring.___
A. later                   
B. last   
C. latter                 
D. late
【单选题】
 Free medical treatment in this country covers sickness of mind as well as _________ sickness.___
A. normal               
B. regular  
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 Although he had looked through all the reference material on the subject, he still found it hard to understand this point and her explanation only _________ to his confusion.___
A. extended           
B. amounted  
C. added               
D. turned
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 A completely new situation will ___________ when the examination system comes into existence.___
A. arise                 
B. rise   
C. raise                 
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Cancer is second only __________ heart disease as a cause of death.___
A. of               
B. to        
C. with           
D. from
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The manager needs an assistant that he can _________ to take care of problems in his absence.___
A. count on      
B. count in      
C. count up      
D. count out
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We gave out a cheer when the red roof of the cottage came __________ view.___
A. from             
B. in         
C. before          
D. into
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They took ________ measures to prevent poisonous gases from escaping.___
A. fruitful         
B. beneficial   
C. valid             
D. effective
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Doing your homework is a sure way to improve your test scores, and this is especially true _______ it comes to classroom tests.___
A. when             
B. since       
C. before           
D. after
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In developing countries people are _______ into overcrowded cities in great numbers.___
A. breaking       
B. filling     
C. pouring         
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There are other problems which I don't propose to ____________ at the moment.___
A. go into        
B. go around     
C. go for         
D. go up
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It is quite necessary for a qualified teacher to have good manners and _________ knowledge.___
A. extensive      
B. expansive     
C. intensive       
D. expensive
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I'm not sure whether I can gain any profit from the investment, so I can't make a(n) ______ promise to help you.___
A. exact             
B. defined     
C. definite         
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The sports meet, originally due to be held last Friday, was finally ________ because of the bad weather.___
A. set off             
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It has been revealed that some government leaders _______ their authority and position to get illegal profits for themselves.___
A. employ       
B. take     
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Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first ________.___
A. intention     
B. attempt  
C. purpose     
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A. lay out          
B. lay off      
C. lay aside       
D. lay down
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All the students in this class passed the English exam ________ the exception of Li Ming.___
A. on                   
B. in      
C. for                 
D. with
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Writing is a slow process, requiring _______ thought, time, and effort.___
A. significant     
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C. enormous     
D. numerous
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Lightning is a ______ of electrical current from a cloud to the ground or from one cloud to another.___
A. rush                 
B. rainbow   
C. rack                 
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I caught a ________ of the taxi before it disappeared around the corner of the street.___
A. vision             
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Physics is ________ to the science which was called natural philosophy in history.___
A. alike               
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The new appointment of our president _______ from the very beginning of next semester.___
A. takes effect   
B. takes part  
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C. 振荡频率稳定
D. 输出波形边沿陡峭
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59以下各电路中,___可以产生脉冲定时。
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【单选题】
555定时电路端不用时,应当___。
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【单选题】
89S51的内部程序存储器与数据存储器容量各为多少?___
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【单选题】
89S51比89C51多出了哪个功能?___
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【单选题】
6在DIP40封装的8×51芯片里,复位RESET引脚的引脚编号是什么?___
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7在DIP40封装的8×51芯片里,接地引脚与电源引脚的引脚编号是什么?___
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9在12MHz始终脉冲的8051系统里,一个机器周期有多长?___
A. 1µs
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【单选题】
12下列哪个寄存器是8×51内的16位寄存器?___
A. CC
B. C
C. PC
D. R7
【单选题】
14在8×51的输入/输出端口里,哪个输入/输出端口执行在输出功能时没有内部上拉电阻?___
A. P0
B. P1
C. P2
D. P3
【单选题】
8×51的P0采用哪种电路结构?___
A. 集电极开路式输出
B. 基极开路式输出
C. 发射机开路式输出
D. 图腾柱输出
【单选题】
17在8×51里,若要扩展外部存储器时,数据总线连接哪个输入/输出端口?___
A. P0
B. P1
C. P2
D. P3
【单选题】
点亮一般的LED所耗用的电流约为多少?___
A. 1~5µA
B. 10~20µA
C. 1~5mA
D. 10~20mA
【单选题】
19一般地,蜂鸣器属于哪种负载?___
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【单选题】
7405/7406的输出采用哪种电路结构?___
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B. 基极开路式输出
C. 发射机开路式输出
D. 图腾柱输出
【单选题】
21在继电器中,NO接点是一种什么接点?___
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【单选题】
22所谓2P的继电器,代表什么意思?___
A. 只有2个接点
B. 两相的负载
C. 两组电源
D. 2组c接点
【单选题】
23共阳极七段数码管显示器的驱动信号有何特色?___
A. 低电平点亮
B. 低电平不亮
C. 高电平点亮
D. 以上皆非
【单选题】
24在8×51的程序里,若要将某个输入/输出端口设置成输入功能,应如何处理?___
A. 先输出高电平到该输入/输出端口
B. 先输出低电平到该输入/输出端口
C. 先读取该输入/输出端口的状态
D. 先保存该输入/输出端口的状态
【单选题】
8×51提供几个外部中断和定时器/计数器中断?___
A. 2,2
B. 3,6
C. 2,3
D. 3,7
【单选题】
8×51的IP缓存器的功能如何?___
A. 设置中断优先级
B. 启动中断功能
C. 设置中断触发信号
D. 定义CPU的网址
【单选题】
28若要让采用低电平触发,则应如何设置?___
A. EX0=0
B. EX0=1
C. IT0=0
D. IT0=1
【单选题】
29在Keil µVision3里进行调试/仿真时,在哪里操作才能触动程序中断?___
A. 在Interrupt System
B. 在Cotorl Box对话框里
C. 直接单击魔术棒按钮即可
D. 直接按0键
【单选题】
30在8×51所提供的中断功能里,下列哪个优先级比较高?___
A. T1
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【单选题】
31在TCON缓存里,IE1的功能是什么?___
A. 触发 IE1中断
B. 指示IE1中断的标志
C. 提高IE1优先等级
D. 取消IE1中断
【单选题】
32在Keil C里,中断子程序与函数又何不同?___
A. 中断子程序不必声明
B. 函数不必声明
C. 中断子程序必须有形式参数
D. 中断子程序一定会有返回值
【单选题】
33若要同时启用INT0及INT1中断功能,则应如何设置?___
A. TCON=0×81
B. IE=0×85
C. IP=0×83
D. IE=0×03
【单选题】
35在8×51的Timer里,若使用Mode 0,其最大计数值为多少个机器周期?___
A. 65636
B. 8192
C. 1024
D. 256
【单选题】
36在12MHz的8×51系统里,哪一种方式一次可定时5ms?___
A. Mode 0及Mode 1
B. Mode 1及Mode 2
C. Mode 2及Mode 3
D. Mode3及Mode 1
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