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

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问题 The passage gives a general description of an invasive insect, HWA.
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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