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问题 单项选择题

对于牙本质过敏，首选的方法为（）。

A.药物脱敏

B.牙髓治疗

C.牙周治疗

D.树脂充填

E.烤瓷冠修复

答案

参考答案：A

单项选择题

把元器件和设备在低于（）下的工作状态叫做轻载。

A、额定电流

B、额定电压

C、额定功率

D、额定电阻
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补全对话，情景问答
从方框中选出适当的句子补全对话，其中有两项是多余的。
A. You're welcome.
B. What's going on?
C. What was the matter?
D. Are you feeling better now?
E. Was it serious?
F. Take more exercise and keep healthy.
G. Did you see the doctor?
A: Hi, Jack. You were not at school yesterday. (1)              
B: Oh, I had a headache and I had to ask for a sick leave.
A: Sorry to hear that. (2)               
B: Yes, my mother took me to the hospital. The doctor looked me over and said I had caught a cold.
A: (3)              
B: Yes, a little. The doctor told me to take these pills three times a day and drink more water.
A: (4)               
B: Yes, much better.
A: (5)               
B: I will. Thank you.
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