原文:biocontrol agent might reduce the benefits conferred by a desirable animal species by consuming a plant on which the animal prefers to lay its eggs.
因为target animal species is unwanted species, so nontarget animal species is wanted/desirable
这题目tricky啊,搞懂文章说的是两种间接影响,1是减少非目标种群所带来的好处,2是引起非目标种群的灭绝,这么another具有提示作用; D说的明显是减少目标种群带来的好处的方式,所以可以排除D 其他选项: A.无关比较,原文没有关于比较脆弱不脆弱的信息 C.nonnative is not mentioned E.most likely 过于绝对,原文只是说了两种影响,但是并没有说具体哪种最有可能出现
D最大的迷惑点在于,容易把两个examples都当作前面论点的支持,大多数例子作用的题目的确是这样,但是这里,原文有一个陷阱:把第一种的负面影响和方式结合在了论点里面,by...... a BA reduce...... 写成这样就清晰了: BA can negatively impact nontarget speices. One indirect negative consequence is......by competing...... Another indirect consequence is.....