单项选择题

A well coherent discourse ______ good choice of cohesive devices and semantic selection among other things.

A．calls for
B．calls on
C．calls up
D．calls forth
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单项选择题
The Martian surface temperature is 100 degrees below zero at night, so that butter put outside will not ______.
A．thaw
B．dissolve
C．melt
D．fuse
单项选择题
The earnings of women are well below that of men ______ educational differences that are diminishing between the two sexes.
A．although
B．though
C．despite of
D．in spite of
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