单项选择题

What was the cause of the tragedy air crash（）

A．Bad weather.
B．Human error.
C．Breakdown of the engines.
D．Failure of the communications system.

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单项选择题
What is the main problem caused by the usual way of plowing？（）

A．The crop’s blooming period is delayed.
B．The roots of crops are cut off.
C．The topsoil is seriously damaged.
D．The growth of weeds is accelerated.
单项选择题
What happened to Edgar Allen Poe’s family, when he was only two years old take sb（）

A．His father caught a serious disease.
B．His mother passed away.
C．His mother left him to marry a rich businessman.
D．His father took to drinking.
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