Global warming and youth crime are the key ___ in the election campaign.A.elements B.factors C.solutions D.issues 为什么?这四个答案的区别在哪里?

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Globalwarmingandyouthcrimearethekey___intheelectioncampaign.A.elementsB.factorsC.solutionsD.issues为什

Global warming and youth crime are the key ___ in the election campaign.A.elements B.factors C.solutions D.issues 为什么?这四个答案的区别在哪里?
Global warming and youth crime are the key ___ in the election campaign.
A.elements B.factors C.solutions D.issues 为什么?这四个答案的区别在哪里?

Global warming and youth crime are the key ___ in the election campaign.A.elements B.factors C.solutions D.issues 为什么?这四个答案的区别在哪里?
理解单词意思就好办了:
A elements 元素,要素
B.factors 因数
C solutions 解决办法
D.issues 话题,议题
而题目中的election campaign 指竞选活动
西方国家竞选是要辩论的,参见美国总统大选,所以涉及全球变暖和青年犯罪这样的议题也就不难理解了