单项选择题

Deforestation is______ one of the most serious environmental issues of our time.

A．explanatorily
B．doubtfully
C．compatibly
D．arguably
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单项选择题
The speculation,______ by some suggestive evidence, came from an American scientist.
A．summed up
B．backed up
C．added up
D．put up
单项选择题
I was______ in the middle of my call because I had no more pennies to put in the box.
A．broken in
B．cut off
C．hung up
D．cut down
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