单项选择题

This passage supports the belief that ______.

A．exact reasons for migration are not known
B．birds migrate because of changes in temperature
C．the ancestral home of all birds was the tropics
D．glaciers caused birds to migrate

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单项选择题

Many people are not aware that it is rather rude to ______.

A．talk casually about old people in front of them as if they were not there
B．show sympathy for the old
C．take care of the old when they are not ill
D．pat the faces of the contemporaries

单项选择题

The passage is mainly about that ______.

A．improper care and concern may do more harm than good to the old
B．how to take good care of the old in different ways
C．nowadays many people are not respectful enough to the old
D．old people are just like children, who are difficult to satisfy