单项选择题

The complicated log-in procedure actually ______ potential clients from using our website more regularly.

A．discourages
B．degrades
C．resolves
D．criticize
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单项选择题
It is important to take ______ when using dangerous tools such as chain saws.
A．precautions
B．details
C．concepts
D．intentions
单项选择题
With a radical new design, the Dust Buster 109 is far more effective than ______ vacuum cleaners.
A．convening
B．convention
C．convenient
D．conventional
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