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【简答题】
According to a new education survey, student safety has become a big problem. Nearly 50 percent of the students say they are worried about robbery on the way to and from school. Now in many big cities in China,some schools have taught an unusual lesson. self-protection;Students like this lesson as there are no exams or boring classes. And they can learn how to save lives and know how to stop danger before it really happens. Chen Haoyu,a teacher at Beijing No. 25 Middle School and a self-protection expert,gives young students advice on how to deal with danger. If you are robbed, keep calm. If you cannot cry for help or run away, give the robber your money, try to remember what the robber looks like and tell the police. If you are in a traffic accident and if you are hurt by a car, take down the car number;if it is a bicycle, try to contact your parents before you let the rider go. This is because you don’t know how seriously you are hurt. Don’t stay in high places and keep away from trees if it is raining hard and there is lightning. Get away as fast as you can when there is a fire.Put wet things on your body and try to find an exit. Do not take the lift! If someone is drowning and you can’t swim, don’t get into the water. Cry out for help. Remember that danger is never as far away as you think. Take care of yourself at all times! 小题1:Why do students like the self-protection lesson? A.Because there is advice on exams B.Because they can learn how to protect themselves. C.Because they like self-protection experts. D.Because they have lots of exams during the lesson. 小题2:The underlined word “ contact ” means_________. A.end up B.wait for C.search for D.get in touch with 小题3:If your house is on fire, you must __________. A.put dry things on your body B.run quickly and take the lift C.take everything you have and then run away D.run away and find an exit as quickly as you can 小题4:If you see a child fall into the river and you are not able to swim, you _______. A.should telephone the doctor B.can jump into the river and save him C.can do nothing D.should shout for help 小题5:What’s the best title for this passage? A.Protection B.Advice on how to deal with danger C.The popular lesson D.An interesting lesson
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A.
同一算法用于加密和解密,但加密和解密使用不同的密钥
B.
两个密钥中的任何一个都可用来加密,另一个用来解密,加密和解密次序可以交换
C.
已知公钥和明文,产生密文在计算上是容易的
D.
接收方利用私钥来解密密文在计算上是可行的
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A.
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B.
1939年
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D.
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A.
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B.
45 钢,淬火+高温回火
C.
T8 钢,淬火+高温回火
D.
45 钢,正火
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端口是传输层和网络层通信的服务访问点
B.
利用传输端口可以识别通信的进程
C.
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D.
TCP/IP将端口分为保留端口和自由端口两类
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纤维素
B.
几丁质
C.
胞壁酸
D.
蛋白质
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A.
强制性
B.
专业性
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A.
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B.
选择性
C.
灵敏性
D.
可靠性
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