单项选择题

What is the main idea of this passage

A．There are three different kinds of loneliness.
B．Chronic loneliness is the most severe kind.
C．Researchers want to cure loneliness.
D．There is some difference between being alone and being lonely.

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单项选择题

What does to do so (in Line 7, Para. 5) mean

A．To question popularity.
B．To have physical problems.
C．To predicts situational loneliness.
D．To make new friends.

单项选择题

Which of the following is NOT truer

A．There are three distinct stages in a mosquito's attack.
B．Scientists discovered mosquitoes prefer to live in dry places.
C．The best way to avoid being attacked by a mosquito is impractical.
D．Repellents keep mosquitoes from attacking its prey by giving off a nasty smell and confusing them.