单项选择题

One morning Pat went to a wood ______.

A．to get a little exercise
B．B ) to take in some fresh air
C．hoping to get something to eat
D．to visit the rich owner
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单项选择题
When a bicycle coasts downhill, it ______.
A．runs along the hillside
B．does not need any further power
C．runs freely to all directions
D．does not meet with air resistance
单项选择题
Why is it not necessary to provide powered flight in space all the time ______
A．Few spacecrafts complete their flight operations.
B．The Earth's gravity cannot be overcome.
C．No further power is needed after the escape speed is reached.
D．"Free fall" takes the place of the Earth's gravity pull.
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