专四
What is the purpose of the national survey?
[A] To collect data on sources of pollution.
[B] To identify pollution in rivers and lakes.
[C] To help control environmental pollution.
[D] To help control industrial wastes.
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A． Census offices are set up by government department
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根据以下资料，回答题：
Dried foods
Nowadays vegetables are most commonly dried
Alkaline solutions are used to