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职称英语
卫生类A级
[单选题]
The discovery ofthe strange stone in the deserted valley has [spurred] series of scientificresearch.
A.encouraged
B.endangered
C.endorsed
D.enlarged
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![The discovery ofthe strange stone in the deserted valley has [spurred] series of scientificresearch.](https://img.zhaotiba.com/tiku75/15023358.jpg "The discovery ofthe strange stone in the deserted valley has [spurred] series of scientificresearch.")