单项选择题

A．One day.
B．Six days.
C．Three days.
D．Eleven days.
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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.
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.
单项选择题
A．Because there is no water there.B．Because there is no air there.C．Because there is no plant there.D．Because there is lifeless.
A．Because there is no water there.
B．Because there is no air there.
C．Because there is no plant there.
D．Because there is lifeless.
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