What caused the American scientists to work on special trees

What caused the American scientists to work on special trees?

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Lessons_____________ easily are soon forgotten.(  )

Lessons_____________ easily are soon forgotten.(  )

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下列情形中,诉讼时效为1年的是( )。

下列情形中,诉讼时效为1年的是( )。

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Several leading teams were sent in order to___________.

Several leading teams were sent in order to___________.

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We know from the last paragraph that the author___________.

We know from the last paragraph that the author___________.

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