单项选择题

Aluminium is the most plentiful metal in the Earth's ______.

A．surface
B．crust
C．outside
D．cap
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单项选择题
Dried vegetables are easy to use if you remember to ______ them overnight.
A．plunge
B．bathe
C．soak
D．immerse
单项选择题
Every word processor we sell comes with a two year ______.
A．assurance
B．protection
C．security
D．guarantee
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