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问题 单项选择题

义齿修复前骨尖修整的最佳时机是

A．拔牙后2周
B．拔牙后3周
C．拔牙后1个月
D．拔牙后2个月
E．以上都不是

答案

参考答案：C

解析：义齿修复前骨尖修整的最佳时机是拔牙后1个月，这时可以确定骨尖是否需要手术修整。

阅读理解

All students need to have good study habits(习惯). When you have good study habits, you can learn things quickly. You can also remember them easily.

Do you like to study in the living-room? This is not a good place because it is usually too noisy(吵闹的). You need to study in a quiet place, like your bedroom. A quiet place will help you only think about one thing, and you will learn better.

Before you begin to study, do not forget to clean your desk. A good desk light is important, too. You’ll feel tired easily if there is not enough light.

小题1:When you have good study habits, you will          .

A．learn things quickly

B．remember things easily

C．think about one thing

D．both A and B小题2:The living-room is not a good place for study because it is too         .

A．quiet

B．noisy

C．good

D．clean小题3:You will feel tired easily if the light is          .

A．good

B．enough

C．bad

D．wonderful小题4:The best title(标题) for this passage is          .

A．Study in the Bedroom

B．Good Study Habits

C．How to Study

D．Desk Light is Important
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单项选择题

对下列遗传术语的理解，错误的是（）

A.相对性状是由等位基因控制的

B.显性性状是由显性基因控制的

C.性状分离是指杂种后代出现了不同的基因型

D.测交可用来测定杂种的基因型
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