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
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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
单项选择题
Melting snow______ the regular spring floods in the valley.
A．lends itself to
B．works out
C．throws light on
D．accounts for
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