问题
选择题
某家庭电话月租金为15元，每次市内通话费平均为0.6元，每次长途通话费平均为1.8元，若半年内打市内电话a次，打长途电话b次，则这半年应付电话费为（ ）
A．0.6a+1.8b
B．15+a+b
C．15+0.6a+1.8b
D．15×6+0.6a+1.8b
答案
根据题意列得：15×6+0.6a+0.8b．
故选D
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某家庭电话月租金为15元，每次市内通话费平均为0.6元，每次长途通话费平均为1.8元，若半年内打市内电话a次，打长途电话b次，则这半年应付电话费为（ ）
A．0.6a+1.8b
B．15+a+b
C．15+0.6a+1.8b
D．15×6+0.6a+1.8b
根据题意列得：15×6+0.6a+0.8b．
故选D
| 完形填空 | ||
| How soon will robots become so clever that they' will be able to do jobs which human can do, such as 2 language or looking after patients in hospital? Some 2 believe this will happen in twenty years. One company has already developed a kind of machine. It 3 as "home-helps" for old people. It can also do such things as cooking eggs and cleaning the floor. The 4 says that the machine will understand simple voice instructions and the machine will be controlled 5 a latest IBM microcomputer. Mr Henry, the director of UAS, believes that his company will develop the clever robots for 6 in industry. By this time, they will begin to sell the machines into ordinary homes. Robots can do much 7 , such as washing dishes, cleaning the house and cooking meals. By the way, the 8 of them may be as little as$ 1,000. But Dr Sandra believes we have a long way 9 truly intelligent machines. She says, "It can cook an egg. But if one of eggs is 10 , it will still cook. If you ask a robot to do something unusual that needs a man to think, a robot is useless." | ||
| ( )1. A. teaching ( )2. A. teachers ( )3. A. can use ( )4. A. company ( )5. A. for ( )6. A. using ( )7. A. homework ( )8. A. price ( )9. A. develop ( )10.A. good | B. buying B. experts B. can be using B. school B. by B. lending B. jobs B. money B. to develop B. big | C. borrowing C. students C. can be used C. hospital C. as C. giving C. housework C. time C. developed C. bad |