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
I haven't seen Diana these past few days. I am afraid she ______ herself for some time.
A. hasn't been feeling
B. isn't feeling
C. wasn't feeling
D. hadn't been feeling
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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