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>> 高等继续教育 / 工程经济学
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佳题速递：
2、所谓加密是指将一个信息经过（ ）及加密函数转换，变成无意义的密文，而接受方则将此密文经过解密函数、（ ）还原成明文。
A. 解密钥匙、解密钥匙
B. 解密钥匙、加密钥匙
C. 加密钥匙、解密钥匙
D. 加密钥匙、加密钥匙计算机安全 3[填空题]
Americans love their cars. When gas was _1_, Americans drove everywhere, even to buy something at a store two or three blocks away. On Sunday’s many families got into the car and went for a drive for an hour or two. _2_, many Americans have been changing their ideas about _3_. Today _4_walk or ride a bicycle to the store, and people think twice before they go for a drive on Sunday.
Today Americans are worried about saving energy in their homes, too. Before OPEC raised oil price, the typical American home and office building was too warm in the winter and too cool warm in the summer. Since 1973, Americans have been more careful with _5_. Many families _6_the heat to 15℃ at night and 18℃ during the day. Perhaps because of this, companies that make long underwear have been doing very well since 1973.
People _7_ everywhere to find ways to save heating oil and electricity. Many people have been buying old-fashioned stoves so as to burn wood. Most people have been more careful to _8_ electric lights. For several years the government has been giving tax money back to people when they improve their homes to save energy. For example, when people spend money to put new and better windows on their houses, the government returns some of their tax money.
Americans don’t like to give up their big cars, warm homes, and air conditioning, but _9_ the high price of oil, they _10_.
1. A. dear B. cheap C. less D. very few
2. A. Because less of money B. Because of so many people
C. Because of the high price of gas D. because of so many cars in the streets
3. A. walking B. buying C. sleeping D. driving
4. A. more people B. few people C. all people D. no people
5. A. heating and air conditioning B. cars and bicycles
C. food and clothing D. children and money
6. A. put up B. set in C. turn down D. turn into
7. A. looked B. look C. are looking D. have been looking
8. A. put on B. put in C. turn off D. turn on
9. A. at B. with C. for D. in
10. A. have a lot of choices B. can do many things
C. don’t have any choice D. walk to work大学英语(二) 患儿2个月，尿三氯化铁试验强阳性，诊断为苯丙酮尿症，准备作饮食控制治疗，其主食不应选用儿科护理学 法人或者其他组织的哪些人员在执行职务中致人损害的，由该法人或者其他组织承担民事责任？侵权行为法学 引起低钾血症的钾跨细胞分布异常有病理生理学(基础医学) 在边际产量曲线与平均产量曲线相交时， 达到最大。
a. 总产量b. 平均产量西方经济学