问题
单项选择题
密码学的历史大致可以追溯到两千年前，相传古罗马名将凯撒为了防止敌方截获情报，便使用密码传送情报，凯撤的做法很______，就是为二十几个罗马字母建立一张对应表，如果不知道对应表，即使拿到情报也是______。 依次填入画横线部分最恰当的一项是（）
A.别致前功尽弃
B.隐蔽枉费心机
C.简单徒劳无功
D.精妙无所适从
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
密码学的历史大致可以追溯到两千年前，相传古罗马名将凯撒为了防止敌方截获情报，便使用密码传送情报，凯撤的做法很______，就是为二十几个罗马字母建立一张对应表，如果不知道对应表，即使拿到情报也是______。 依次填入画横线部分最恰当的一项是（）
A.别致前功尽弃
B.隐蔽枉费心机
C.简单徒劳无功
D.精妙无所适从
参考答案：C
| 完形填空。 | ||||
| On a snowy evening, a rich lady was standing by the road. She was very worried. Her 1 had broken down. Just then a poor man named Robert came. He was on his 2 back home from work as usual. The lady wondered, "Is the man going to 3 me? He looks very cold and hungry." But to her surprise, 4 stopped and said with a smile, "Can I help you, madam?" After forty 5 , the car was at last fixed by Robert. The lady wanted to pay him. "No, that's 6 , madam." he said, "I was just helping someone in 7 . If you really want to pay me back, I hope 8 you see someone in need, you should give him a hand." A few minutes later, the lady 9 a shabby (破旧的) house by the road. She remembered Robert's words, so she stopped. The hostess (女主人) warmly asked her 10 . The lady could see that was a 11 family and that they needed help. When the hostess was making tea in the kitchen, the lady 12 on a table 500 dollars and went away quietly. Robert came home later than before, thinking how 13 their life was. His wife was pregnant (怀孕) and the baby was to be born the next month but there was not 14 money. His wife went up to him, gave him a kiss and said softly, "Don't worry, dear! Everything's going to be all 15 . A stranger has helped us out." Let's always be ready to help others because helping others is helping ourselves. | ||||
|