单项选择题

The author of the article must be ______ with environmental problem here, and all the details given are correct.

A．informed
B．acquainted
C．enlightened
D．acknowledged
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单项选择题
As long as he is given enough time, I am ______ sure he can do it well.
A．good--looking
B．beautiful
C．nice
D．pretty
单项选择题
Years ago, many of the machines were operated ______ but now they are operated by computers.
A．manually
B．artificially
C．automatically
D．synthetically
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