单项选择题

A．They may not be able to inflate their balloons.
B．There are too many balloons to launch at once.
C．Their flight pattern could be uncertain due to the wind.
D．They’ll lose money if some balloons can’t take off.
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单项选择题
A．Unavailability of warm clothing. B．Bicycle maintenance. C．Increased illness. D．Increased commuting time.
A．Unavailability of warm clothing.
B．Bicycle maintenance.
C．Increased illness.
D．Increased commuting time.
单项选择题
A．To correct mistakes in spelling and grammar. B．To make smooth transitions between ideas. C．To add more specific details and examples. D．To improve overall effectiveness.
A．To correct mistakes in spelling and grammar.
B．To make smooth transitions between ideas.
C．To add more specific details and examples.
D．To improve overall effectiveness.
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