单项选择题

After the new technique was introduced, the factory produced ______ tractors in 1988 as the year before.

A．as twice many
B．as many twice
C．twice as many
D．twice many as
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单项选择题
The chief reason for the population growth isn t so much a rise in birth rates ______ a fail in death rates as a result of improvements in medical care.
A．and
B．as
C．but
D．or
单项选择题
WHO-UNICEF estimates now indicate that over 250 million children still suffer from vitamin A deficiency with many millions ______ are at risk.
A．more
B．less
C．least
D．most
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