问题
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Some well-known scientists believe that there is not enough oxygen on Mars to ______ human
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Believe it or not, when first ______ to Europe, tomato was thought to be poisonous.A.to in
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Not for a(n) __________ did I believed he had lied.A. timeB. ageC. periodD. instant
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Several centuries ago people did not believe that the earth______round the sun.A.revolvedB
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Some people did not like Uncle Tom‘s Cabin chiefly because__________.
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Some well-known scientists believe that there is not enough oxygen on Mars to ______ human
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