单项选择题

What's the main idea of this passage

A．High-tech life may be risky.
B．It's difficult to make friends in modern world.
C．Juvenile crime is rising in Japan.
D．More electronic pets are turned out.
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单项选择题
His presentations are so __________ that we can't make sense of his real meaning.
A．arbitrary
B．ambiguous
C．straightforward
D．rigorous
单项选择题
Uniform road signs are put to avoid frequent accidents at __________ turns.
A．abrupt
B．adverse
C．alien
D．apt
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