单项选择题

The research unit aims to help people to ______.

A．invent complete electronic equipment
B．become physically independent
C．gain confidence about themselves
D．master difficult problems
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单项选择题
Which of the following can account for a large part of the high American mobility rate
A．Divorce and morality.
B．Expansion of industry and commerce.
C．Changes in the labour force.
D．None of the abov
单项选择题
The phrase encroach upon in Paragraph 2 most probably means ______.
A．"buy and sell"
B．"measure and survey"
C．"invade and occupy"
D．"rent and share"
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