单项选择题

Which of the following countries has not yet opened its labor market ______.

A．Britain
B．Holland
C．Portugal
D．Greece
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单项选择题
Where is the gravitational pull of both the earth and the moon on an object equal
A．In the middle between the earth and the moon.
B．A point closer to the earth between the moon and the earth.
C．A point closer to the moon between the earth and the moon.
D．No such point exists.
单项选择题
This short passage is mainly about ______.
A．the rocket
B．the pull of the earth
C．the pull of the moon
D．the gravitational pull of the earth and moon
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