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。
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单项选择题
By the year 2000, today's ______ nations will have a total population of 5 billion people, nearly four fifth of the world's population.
A．biggest
B．Asian
C．developing
D．developed
单项选择题
A population explosion will lead to ______.
A．a lot of social problems
B．medical advances
C．a decrease in food production
D．a worse life in every nation with 3 billion
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