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问题 单项选择题

牙槽骨吸收程度分三度，Ⅱ度吸收是指()

A．吸收≤1/3根长

B．1/3根长＜吸收＜2/3根长

C．1/2根长≤吸收≤2/3根长

D．1/3根长≤吸收≤1/2根长

E．≥2/3根长

答案

参考答案：B

选择题

西周时期的王位世袭制与夏商时期相比，最突出的特点是（  ）

A．民主推选

B．兄终弟及

C．嫡长子继承

D．父死子继
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补全对话，情景问答
从方框中选择合适的句子补全对话。
A. What time is it?
B. What is my father doing?
C. Good afternoon, Jack.
D. What would you like for supper?
E. May I help you?
A: Good afternoon, Mum.
B: 1_______________________________
A: 2_______________________________
B: It's five forty.
A: Oh, time for supper.
B: 3_______________________________
A: I would like some meat and carrots.
B: OK. I'll make at once.
A: 4_______________________________
B: Sure. You can help me wash the carrots.
A: OK. I'm happy to do it. 
    5_______________________________
B: He is reading a newspaper.
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