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问题 单项选择题

最常见的牙源性肿瘤为( )

A．成釉细胞瘤

B．多形性腺瘤

C．牙骨质瘤

D．牙源性黏液瘤

E．以上均不正确

答案

参考答案：A

解析： 成釉细胞瘤为颌骨中心性上皮肿瘤，在牙源性肿瘤中较为常见。

完形填空

完形填空（10分）

　　What will our life be like in the future? Each family will have a  1 in the future. You can ask it to do everything  2  you. It will serve(服务) you  3 hours a day. The robot will  4 like a human. It can talk with you when you are  5 . You won’t know it is a human  6 a robot when you meet it on the street.

　　People will have  7 time to work and more time to travel. The vehicles(交通工具) in the future will fly freely in the sky because every vehicle will have wings(翅膀) with it. They will  8 you to any place you want to visit. You can go to  9  when you have a travel if you feel tired. All vehicles will be  10  because of driving by robots.

小题1:A、rocket              B、robot               C、car

小题2:A、on                 B、about               C、for

小题3:A、eight              B、twenty              C、twenty-four

小题4:A、sound              B、live                C、look

小题5:A、happy              B、alone               C、comfortable

小题6:A、so                 B、and                 C、or

小题7:A、less               B、few                 C、more

小题8:A、make               B、take                C、let

小题9:A、school             B、work                C、sleep

小题10:A、safe              B、dangerous           C、unpleasant
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解答题

某种商品原价m元，第一次降价a%，第二次在第一次降价后的基础上再降价a%，用代数式表示两次降价后的价格．
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