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问题 判断题

古建筑中常用楠木作主要构架材料，用红木、花梨木、铁梨木、椴木作装修木材。

答案

参考答案：对

单项选择题 共用题干题

某患者，男，15岁。检查：恒牙牙合，第一磨牙关系呈中性，上下颌尖牙唇向低位，无间隙。上下颌右侧中切牙反牙合，上颌牙列拥挤9mm，下颌牙列拥挤7mm，外观无骨骼畸形。X线头影测量：各测量值基本在正常范围之内。

你认为该患者矫治方案的拔牙模式可选择 （）

A.不拔牙

B.拔除4颗第二前磨牙

C.拔除4颗第二磨牙

D.拔除4颗第一前磨牙

E.拔除2颗上颌第一前磨牙
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补全对话，情景问答
从方框中选择恰当的句子补全下列对话，使对话意思完整。(其中有两项多余)。
A. What's it used for?
B. That sounds interesting.
C. It's very useful.
D. How can it fly?
E. Who invented it?
F. How was it invented?
G. It's used for opening and locking our auto-bike.
A: Look at that strange thing, Wei Hua! What's that?
B: It's a key. 1            
A: Auto-bike? What's it then? 2            
B: It's a battery-operated machine and it was invented by my father!
A: 3            
B: It's used for riding or flying.
A: Flying? 4            
B: You can just ride it like an auto-bike and it will fly as it goes faster enough.
A: 5             I think your father is so great!
B: I think so. He has invented many things.
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