单项选择题

The passage is mainly about ______.

A．attempts to find efficient ways of recycling wastes
B．efforts to protect the environment in British cities
C．a good way to locate plants for waste recycling
D．a cheap way to get energy from waste materials
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单项选择题
Which of the following statements is NOT true according to the passage
A．The concept of "old" is differently defined in different times.
B．Nobody can remain physically healthy throughout the life.
C．The progress in medical knowledge has contributed a lot lo longer lives of us.
D．Older people may get ill and physically disabled more easily than younger ones.
单项选择题
It can be inferred from the passage that ______.
A．whether one is old or young depends on how he thinks about it
B．it is very hard for older people to stay as healthy as the young
C．people in the past lived a short life because they deserted their ideals when they were still young
D．people in the past preferred to look old while all want to appeal' as young as possible at present
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