单项选择题

A．He is very quiet.
B．He gives amusing lectures.
C．He should give more than one series of talks.
D．He lectures only to the serious students.
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单项选择题
The passage implies that American pig iron was _______.
A．low in cost and high in quality
B．low in cost and low in quality
C．high in cost and high in quality
D．high in cost and low in quality
单项选择题
A．The high temperatures required for its use.B．The high cost of materials used in its production.C．The lack of trained environmental engineers.D．The opposition of automobile manufacturers.
A．The high temperatures required for its use.
B．The high cost of materials used in its production.
C．The lack of trained environmental engineers.
D．The opposition of automobile manufacturers.
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