单项选择题

Britain has the highest ______ of road traffic in the world—over 60 cars for every mile of road.

A．popularity
B．density
C．intensity
D．prosperity
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单项选择题
Their products are frequently overpriced and ______ in quality.
A．influential
B．inferior
C．superior
D．subordinate
单项选择题
If people feel hopeless, they don't bother to ______ the skills they need to succeed.
A．adopt
B．acquire
C．accumulate
D．assemble
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