单项选择题

The manufacture of (automobile) was (extremely) expensive (until) assembly-line techniques (made) them cheaper to produce.

A．automobile
B．extremely
C．until
D．made
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单项选择题
Whether the giant panda belonged to the bear of raccoon families was a matter of zoological contention for years.
A．controversy
B．confusion
C．enterprise
D．scrutiny
单项选择题
Within the bounds of given data, the biographer seeks to illuminate factual information about a person and transform it into insight.
A．concentration
B．networks
C．goals
D．constraints
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