第17题: [单项选择]Scientists hope the collision will produce a large crater in the comet's surface in order to reveal the core and give some ______ to the origin of the solar system. A. sources B. interpretations C. clues D. observations 参考答案:C 答案解析:考名词和介词to的搭配。句子是一个主从复合句,在从句中又有一个并列的目的状语。sources是“来源,出处”,一般与of搭配;interpretations是“解释,说明;翻译”,也是与of搭配;cl