单项选择题

First of all, we applied ourselves to identifying the root cause of our national problems.()

A.首先,我们致力于找出民族问题的根源。
B.起初,我们申请了研究民族问题。
C.首先,我们要了解民族问题存在的原因。
D.起初,我们应弄清民族问题的原因。

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单项选择题
Some investigations show that the cause of the accident may be the plane engine's failure to operate.()

A.调查表明,事故原因可能是飞机引擎未能发动。
B.调查表明,飞机失事原因可能是引擎失灵。
C.一些调查显示,事故原因可能是技师不当驾驶造成的。
D.一些调查显示,事故原因可能是引擎使用不当。

单项选择题
This passage tells us that()

A.the United Nations thinks it possible to avoid a population explosion
B.5.1 billion people are living in the underdeveloped countries
C.in advanced nations the population growth is being controlled
D.the world's population is increasin

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