单项选择题

His speech gave us valuable ______ into the problems of education.

A．inquiry
B．investigation
C．input
D．insight
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单项选择题
Aluminium is the most plentiful metal in the Earth's ______.
A．surface
B．crust
C．outside
D．cap
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
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