单项选择题

To their credit the Department of Energy ______ these ideas and funded a detailed study.

A．took over
B．took on
C．took up
D．took to
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单项选择题
To an especially sensitive child, a simple scolding can be a ______ experience.
A．hysterical
B．grievous
C．gracious
D．sensible
单项选择题
Nowhere in nature is aluminum found free, owing to its always ______ with other elements, most commonly with oxygen.
A．being combined
B．having combined
C．to combine
D．combined
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