单项选择题

In Para. 1, the writer suggests that the Secretary of State for the Environment has ______.

A．created an impossible target
B．provided a target without a method
C．given clear details of how to achieve a target
D．given manufacturers a target to aim for
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单项选择题
According to the passage, recycling is only possible when ______.
A．it is monitored by the government
B．different collection schemes operate
C．there is enough clean material
D．there is a small amount of clean material
单项选择题
The problem of deciding at what point a baby's imitations can be considered as speech ______.
A．is not especially important because the change takes place gradually
B．is important because words have different meanings for different people
C．is one that can never be properly understood because the meaning of words changes with age
D．is one that should be completely ignored because children's use of words in often meaningless
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