单项选择题

On the top of some very high mountains snow ______ throughout the year.

A．insisted
B．persevered
C．persisted
D．kept
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单项选择题
A．besideB．atC．byD．on
A．beside
B．at
C．by
D．on
单项选择题
The United States has some strange laws. For instance, the government permits cigarette companies to advertise their products in magazines and newspapers, yet it______ cigarette commercials on TV.
A．leaves
B．allows
C．demands
D．bans
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