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
The report deals with British's industrial problem, ______ from technology gaps to lack of investment.
A．diversifying
B．ranging
C．differing
D．altermating
单项选择题
It was all I could do to ______ my anger.
A．cover
B．hide
C．enclose
D．Suppress
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