单项选择题

What does the word "undermine" in Paragraph 4 mean

A．Strengthen.
B．Weaken.
C．Disturb.
D．Fortify.
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单项选择题
One of the most pressing problems regarding the sea is its conservation because of ______.
A．the high percent decrease of fish catches during the past forty years
B．ever-increasing amount of waste dumping into the sea
C．invalidness of an international law
D．Both A and B
单项选择题
According to ______, intelligence is something inborn, not something attained through effort.
A．the Confucian societies of East Asia
B．people in the West
C．many students in the West
D．Lewis Terman
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