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【答案及解析】
73. attacking。根据划线单词所在句子的语境Beetles are invading ash trees in the United States and now have killed at least twenty million of them可知,invading意为“攻击,袭击”,于是在文章的第五段The insect is attacking tree farms and can also spread when logs and firewood are transported可找到attacking一词。
74. Their larvae drill into the trees’ inner bark. / Their larvae feed on the trees’ inner bark. 根据文章第四段最后两句Then the young larvae drill into and feed on the inner bark. This harms the ability of the tree to transport water and nutrients 可知。
75. To stop the trees’ disappearing. 根据文章最后一段 There are worries that the ash tree might disappear unless the invasion is controlled. To prepare for such a possibility, a government laboratory is collecting seeds from ash trees可知(from www.nmet168.com)。
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