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问题 单项选择题

图形的符号为黑色，底色为橙色的标志是（）。

A.易燃气体

B.毒性气体

C.自然物品

D.爆炸物

答案

参考答案：D

选择题
Was it from the lake _____ he often went fishing _____ he saved the drowning girl?

A. that; that
B. where; where
C. where; that
D. that; where
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选择题

The study you have been making _____ the ancient Chinese characters is an instructive job.

A．to

B．for

C．of

D．from
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