填空题

Why will Billie Smith give the presentation He will help them to solve the problem of ______.

【参考答案】

hyperactive child
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Examples of water pollution are very common. Indeed, it is hard to find a major river or lake that has not been polluted in some way. Almost all major industries have put wastes into our water. Producers of steel, coal, cars, chemicals, wood products, paper, and food are only a few.
填空题
What will they learnThey will learn about ______.
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