4.I think we should (clean )__________up our neighborhood.
III.Read the passage and answer the questions (2ms )
Everyone wants to reduce pollution.But the pollution problem is as complicated as it is serious .It is
complicated because much pollution is caused by many things that benefit people .For example,exhaust
from automobiles causes large percentage of air pollution .But the automobiles provide transportation to
millions of people. Factories discharge much of the material that pollutes air and water,but factories give
employment to a large number of people.
Questions:
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