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固定桥最重要的支持基础是牙龈。()
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The United States discovered in 1982 that about one-fifth of its farmland ______ topsoil at a rate likely to diminish the soils productivity.
I will ______ to this opinion until proof that I am wrong is presented.
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Because these lines are taken out of context, they do not ______ the message the author intended.
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