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What would you do if a stranger gave you some medicine and it would keep you slim or help you do well in exams? Would you take it? Students at Shenzhen Luohu Foreign Language Middle School have learned to keep themselves safe by saying “no”. In fact, what those strangers want to give them are drugs (毒品) . Drugs are dangerous to your health! “Because teens don't know much about drugs, they might want to try them,” said Zhang Dongsheng, the director of Shenzhen Drug Control Office. Now, many schools arrange courses or organize some activities to help students know about drugs. Liang, 16, was a good student before trying drugs. One day, some old friends told him it would be fun. After taking drugs only once, he found it very hard to stop. Liang began to spend all his time and money on drugs. Soon, he stopped going to school and started stealing. In the end, he was put in prison. In China, taking drugs is becoming a big problem for teens. According to a survey, about one million people in China were using illegal drugs last year, and 72% of them were young people. Worse still, there are about10,000 drug users under 16 now. Zhang has some good advice on staying clean. He said, “Drugs are dangerous. Never try them, even if you’re curious! It is the most important for you to keep safe and healthy.” 小题1:Teens wants to try drugs because _________ . A.they are 18 years old B.they aren't curious about drugs C.they have enough money D.they don't know about the harm of drugs 小题2:From Liang's story, we can know that it’s _________ to give up drugs even if one tries only once. A.easy B.hard C.foolish D.possible 小题3:According to a survey, about _______ young people in China were using illegal drugs last year. A.1,000,000 B.100,000 C.10,000 D.720,000 小题4:What does the phrase “staying clean” here mean? A.Being clean. B.Keeping clothes clean. C.Staying away from drugs. D.Wearing clean clothes.
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举一反三
【简答题】信源编码的任务:1将输入通信系统的( )信号变换成适合数字通信系统处理和传输的( )信号;2提高数字通信系统的( ) , 尽可能减少信号中的( ),压缩信号带宽,使单位时间、单位系统频带上所传输的信息量最大。
【单选题】所的可信任系统(TrustedSystem)是美国国防部定义的安全操作系统标准,作系统UNIX和WindowsSER、'ER等可以达到该标准的()级.
A.
.D
B.
Cl
C.
C2
D.
B2
【判断题】【单选】U形液柱式压力表适宜用来测量压力较小的工质压力。(5.0分)A. 对 B. 错
A.
正确
B.
错误
【多选题】下列说法中正确的是()。
A.
为了显示地质和河床深度变化情况,标高方向的比例比水平方向的比例小
B.
纵向立面图和平面图的绘图比例不相同
C.
用立面图表示桥梁所在位置的现况道路断面
D.
平面图通常采用半平面图和半墩台柱平面图的图示方法
E.
剖面图通过对两个不同位置进行剖切,组合构成图样进行图示
【单选题】采用〔 〕的位置伺服系统只接收数控系统发出的指令信号,而无反馈信号。
A.
闭环控制
B.
半闭环控制
C.
与控制形式无关
D.
开环控制
【判断题】【是非题】U形液柱式压力表适宜用来测量压力较小的工质压力。A. 对 B. 错
A.
正确
B.
错误
【简答题】确保信息系统按照预期运行且不做任何多余的事情,系统所提供的信息机密性可以得到适度的保护,系统、数据和软件的完整性得到维护和统一,以防任何可能影响任务完成的非计划的任务中断。综合起来说,就是要保障电子信息的“()”。
【单选题】所谓的可信任系统(Trusted System)是类国国防部定义的安全操作系统标准.常用的操 作系统UNIX和Windows SERVER等可以达到该标准的()级。
A.
D
B.
C1
C.
C2
D.
B2
【判断题】驻车制动器拉起时仪表指示灯应该熄灭。( )
A.
正确
B.
错误
【单选题】采用( )的位置伺服系统只接收 数控系统发出的指令信号,而无反馈信号。
A.
闭环控制
B.
半闭环控制
C.
开环控制
D.
与控制形式无关
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