单项选择题

The passage is mainly about ______.

A．the average life expectancy
B．the situation of being old
C．the differences between the old and the young
D．the way to stay young when-one is actually old
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单项选择题
Which of the following statements is NOT true according to the passage
A．There will be no rubbish after the plants have been built.
B．Recycling plants will be in great need in some big cities.
C．The plants can only process paper and rubber but not steel or copper.
D．We don' t have a very good way of sorting and separating the rubbish.
单项选择题
According to the passage, the reason for big cities to build their own recycling plants is that ______.
A．they can be of great help to the protection of environment
B．it is more expensive to process wastes in a farther dump
C．they can make the wastes into something that is useful
D．they can produce a lot of energy for the local residents
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