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问题 选择题

下列各项中，属于生产者与消费者关系的是[ ]

A．老虎吃野兔

B．蛇吃老鼠

C．青蛙吃昆虫

D．庄稼被蝗虫吃

答案

D

选择题
The coal miners ____ in the coal mine for 10 hours before we came to their rescue.

A. had trapped
B. had been trapping
C. had been trapped
D. would have been trapped
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单项选择题 A1/A2型题

方丝弓矫治器中控制牙齿垂直向调整的是（）

A.内收弯

B.外展弯

C.后倾弯

D.转矩

E.以上都不是
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