单项选择题

The designing of a satellite in the heavenly environment is _________an easy job.

A．by all means
B．by any means
C．by means of
D．by no means
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单项选择题
There are certain _________when you must interrupt people who are in the middle of doing something.
A．occasions
B．conditions
C．environments
D．situations
单项选择题
Our journey was slow because the train stopped _________ at different villages.
A．gradually
B．unceasingly
C．continually
D．continuously
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