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问题 单项选择题

患者，女性，40岁，半年来觉下前牙龈增生，影响美观，偶刷牙出血。检查：见下前牙唇侧牙龈轻度增生，质地有弹性，色近正常，探及少量龈上及龈下结石。

若患者长期服用硝苯地平，则最根本的治疗是（）

A.龈上、下洁治辅以手术修整牙龈外形

B.拔除累及牙

C.手术切除和修整牙龈外形

D.停药或换其他药

E.彻底消除菌斑

答案

参考答案：D

选择题

在进行实验探究时，为了增强实验的说服力，一般还应同时设计：

A．分组实验

B．重复实验

C．独立实验

D．对照实验
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填空题

用所给单词的适当形式填空。

l.  It takes my mother an hour _____ (listen) to music.

2. Emily _____ (not take) the train to school from Monday to Friday.

3. They enjoy _____ (their) on Sundays.

4. There are many tall buildings now in many _____ (city).

5. Is Caral _____ (ride) his bike?

6. He has two ways of _____ (get) to school.

7. In summer people often go swimming in ______ (river).

8. We need _____ (study) again after school.

9.  Listen! A small number of students _____ (talk) in the classroom.

10. They usually ride their _____ (bike) to work.

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