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、emphasize

答案 C

解析 synthetics合成物；hypotheses假设，假说；summary总结；emphasize强调。句意：通过研究已经产生了许多化学合成物，以用于将来加工制造各种实物。

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