The passage gives a general description of an invasive insect, HWA. [br] Since 1

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问题 The passage gives a general description of an invasive insect, HWA. [br] Since 1951 the HWA has spread to more than ______ .

选项

答案 15 U.S. states

解析根据题干中的信息词1951定位原文，在Acting Quickly下第一段可找到答案。

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[originaltext]Hello,everyone!Thereisageneralperceptionthatwecan’t