单项选择题

When our imports ________ our exports, we say we have a favorable trade balance; however, when our imports and exports are the other way round we say we have an unfavorable trade balance.

A．fall short
B．fall short of
C．run out of
D． are lack of
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单项选择题
Praise is like warm sunshine. It not only brings joy to ________ who are praised but also adds pleasure to ________ who praise.
A．these; these
B． we; us
C． them; them
D．those; those
单项选择题
The miners escaped the danger by ________.
A． a hair breadth
B． hair breadth
C．hair's breadth
D．a hair's breadth
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