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

游客2023-07-31 50

问题 The passage gives a general description of an invasive insect, HWA. [br] The Hemlock in the U.S. will be saved from HWA soon.

选项 A、Y
B、N
C、NG

答案 C

解析文章后半部分讲到为了控制HWA，美国已在受灾部分地区投放HWA的天敌St bettles，但是在文章倒数第二段末尾指出这种方法是否有效还无法判断(too early to measure their impact)，故本题表述正确与否未可知。

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