单项选择题

I must congratulate you（）the excellent design of the new bridge.

A. with
B. of
C. at
D. on

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单项选择题
With the increasing unemployment rate, workers who are 50 to 60 years old are usually the first to be______.
A. laid off
B. laid aside
C. laid out
D. laid up
单项选择题
The ship’s generator broke down, and the pumps had to be operated ______ instead of mechanically.
A. artificially
B. automatically
C. manually
D. synthetically
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