单项选择题

The World Health Organization fights against （） diseases all over the world.

A．ingenious
B．infectious
C．influential
D．indignant

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单项选择题
The Japanese used to（）ten million tons of coal each year.

A．extract
B．contract
C．subtract
D．constrain
单项选择题
Richard was his father's only （）, as he had no brothers or sisters.

A．offspring
B．heritage
C．heir
D．heiress
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