第5题: [单项选择]Compared mathematically to smoking and driving, almost everything else seems relatively risk-free, ______ almost nothing seems worth regulation. A. yet B. since C. so D. even though 参考答案:C 答案解析:(so因此)。句意为:如果将其他的事情同抽烟和驾驶进行精确的比较,那么其他东西几乎没有什么风险。因此,似乎没有什么东西值得管理。A.yet然而;B.since后来;D.even though即使。