单项选择题

They took ______ measures to prevent poisonous gases from escaping.

A. fruitful
B. beneficial
C. sufficient
D. effective
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单项选择题
According to the passage, which is the oldest university in Germany
A. University of Hamburg.

B. University of Bonn.
C. Heidelberg University.

D. Technical University Berlin.
单项选择题
A. Too old. B. Twice a week.C. 20 kilometers. D. Two weeks.
A. Too old.
B. Twice a week.
C. 20 kilometers.
D. Two weeks.
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