New ways have been found to prevent the river ______.


  1. A.
    not to be polluted
  2. B.
    against polluting
  3. C.
    from polluting
  4. D.
    from being polluted
D
固定詞組。Prevent sb (from) doing sth阻止某人做某事；句意：新的方法已經(jīng)被發(fā)現(xiàn)來阻止河流被污染。
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　 Attention deficit（不足）hyperactivity（活動(dòng)過度）disorder is known by the letters A．D．H D．Children with A．D．H．D．might have trouble paying attention．They might not seem to listen and might forget things．They might not be able to stay seated or play quietly．They might talk too much and act and speak without thinking about the results of their behavior．These are among the signs named on the web site of America’s Centers for Disease Control and Prevention．

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●Perhaps they don’t seem to listen.

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●Levels of some proteins are lower than normal.

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