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.

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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.
单项选择题
According to the speaker, which group of people makes up of the majority of the illiterate population （）

A．Women.
B．Prisoners.
C．Manual workers.
D．School age children.
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