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

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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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