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

Lonely people have social contacts ______.

A．until they produce good health
B．because they can ask for help
C．but they think they do not have enough
D．and therefore they can get emotional support from their friends

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.