单项选择题

A．It’’s already full.
B．It’’s only offered in the morning.
C．It’’s only open to poetry majors.
D．It requires another class first.
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单项选择题
What is the real cause of the potential water crisis
A．Only half of the world’’s water can be used.
B．The world population is increasing faster and faster.
C．Half of the world’’s water resources have been seriously polluted.
D．Humanity has not placed efficient value on water resources.
单项选择题
Boys have a higher risk of developing heart disease than girls.
A．Y
B．N
C．NG
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