单项选择题

Overdose of sleeping pills can be______so the prescription of them is limited.

A．deadly
B．fatal
C．lethal
D．hazard
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单项选择题
Since the early nineties, the trend in most businesses has been toward on-demand, always-available products and services that suit the customer s______rather than the company s.
A．benefit
B．availability
C．suitability
D．convenience
单项选择题
Urgent measures should be taken to control the______of the disease.
A．distribution
B．dissemination
C．dispersion
D．dissipation
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