单项选择题

______ that the demand for power continues to rise at the current rate, it will not he long before tradi-tional sources become inadequate.

A．Concerning
B．Ascertaining
C．Assuming
D．Regarding
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单项选择题
Some professors prefer to control discussion while others prefer to guide the class without______ it.
A．enforcing
B．dominating
C．enhancing
D．disposing
单项选择题
Recently a number of cases have been reported of young children ______ a violent act previously seen on television.
A．modifying
B．duplicating
C．accelerating
D．stimulating
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