47. Displays of the aurora borealis, or "northern lights," can heat the atmosphere over the arctic enough to affect the trajectories of ballistic missiles, induce electric currents that can cause blackouts in some areas and corrosion in north-south pipelines. A. to affect the trajectories of ballistic missiles, induce B. that the trajectories of ballistic missiles are affected, induce C. that it affects the trajectories of ballistic missiles, induces D. that the trajectories of ballistic missiles are affected and induces E. to affect the trajectories of ballistic missiles and induce
1. 习语 ： enough to do sth. （一级排除B,C,D） can heat... enough to affect in A and E is more idiomatic than the use of the subordinate clause beginning with that
2.平行结构：（二级排除A,） 数的一致和时态的一致 平行结构只有两个的时候必须用连词，不能只用 逗号。 A，B＝＝＞Ａand B Induceè带来 Affectè影响 两个都是抽象动作
3. 单复数一致 C lacks agreement in using the singular pronoun it to refer to the plural noun displays.
4．句子完整性and D is faulty because induces cannot fit grammatically with any noun in the sentence. è没有动词发起者