单项选择题

These are the greatest （） in human life.

A．situations
B．happenings
C．conditions
D．facts

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单项选择题
Aeroplanes usually do not need to climb quickly or fly high in the polar region because（）.

A．they do not land there
B．there are no clouds at all
C．they can cross the ice with special equipment
D．it is very cold
单项选择题
These three events （）all human beings.

A．affected
B．have affected
C．are affecting
D．affect
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