单项选择题

If an adder hears you approaching, it will usually ______.

A．move out of your path
B．take no notice of you at all
C．disappear very quickly
D．wait until you are close and then attack
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单项选择题
What is the key issue the author discusses in this passage
A．How to make workers enjoy life better.
B．How to make workers work shorter hours.
C．How to make workers more productive.
D．How to make jobs more interesting to workers.
单项选择题
According to the author, varied jobs ______.
A．make workers more productive
B．make the worker's life more enjoyable
C．make workers work much harder
D．make things much easier for workers
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