Research has produced many new _______ that will be used in the manufacture of a

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问题 Research has produced many new _______ that will be used in the manufacture of a variety of goods.

选项 A、hypotheses
B、summaries
C、synthetics
D、emphases

答案 C

解析 A．hypotheses假说，臆测；B．summaries概要，总结；C. synthetics合成物，人造物；D．emphases强调，重点。根据句意应选C。句意为：通过研究生产了很多新的合成物质，它们用来制造各种各样的商品。

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