单项选择题

A．Watch for changes in weather.
B．Watch their altitude.
C．Check for weak spots in their balloons.
D．Test the strength of the ropes.
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单项选择题
A．Shopping for shoes.B．Writing an article.C．Reading the magazine.D．Studying for a chemistry test.
A．Shopping for shoes.
B．Writing an article.
C．Reading the magazine.
D．Studying for a chemistry test.
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