The scientists ______ in sending Yang Liwei into outer space and bring him back to the earth.

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The concept of television, _____ images over distances, had intrigued scientists even before the invention of moving pictures or radio.

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单选题

_____ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.

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单选题

The Romantics emphasized _____.

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Some of the scientists held the point ______ ______ the book said was right.

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单选题

Tom is the _____ of the two.

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