单项选择题

It is true that there are still abundant reserves of metals which have not yet been______, but it is necessary to take steps to ensure that alternative materials are substituted whenever possible.

A．utilized
B．mobilized
C．acquired
D．cultivated
<上一题 目录 下一题>
热门 试题

单项选择题
The bond of true affection had pulled us six very different men from six very different countries across Antarctica; we proved in the end that we weren't very different______.
A．for all
B．as usual
C．after all
D．in particular
单项选择题
She had on the dress that I used to admire more than anything else in her possession a light blue one______ prettily with lace.
A．ornamented
B．trimmed
C．furnished
D．decorated
相关试题