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Earth is a target in a cosmic shooting gallery,subject to ra

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Earth is a target in a cosmic shooting gallery,subject to random violent events that were unsuspected a few decade ago.
我选的是 Since most violent events on Earth occur randomly,nobody can predict when or where they will happen.
Until recently,nobody realized that Earth is exposed to unpredictable violent impacts from space
Earth is a target in a cosmic shooting gallery,subject to ra
你选的答案错在since一词,since在这里表示因果关系,而原句前后句没有因果关系的提示,所以应该排除.
正确答案只是重复和原文内容,没有臆造任何逻辑关系,所以没有错误.
回答句子改写题,抓住句子主干和逻辑关系就能排除掉至少2个选项.因为错误选项的设置方法之一就是“添加逻辑关系词”,TOEFL句子改写的核心在于:“逻辑大于内容”!不搞清楚这点,其他类似的题也会错的.祝考试顺利!
再问: subject to random violent events 但是我看这里面有个 random violent events,所以我觉得since不对吗
再答: subject to random violent events 和most violent events on Earth occur randomly的确一样,但是原文中,逗号前后是并列关系,但是选项中,由于since一词,两句之间为因果关系,属于画蛇添足,无论内容多么一致,逻辑关系不允许随意添加