题目内容
随着心脏病成为人类的第一杀手，人体血液中的胆固醇含量越来越引起人们的重视。一个人血液中的胆固醇含量越高，患致命的心脏病的风险也就越大。至少有三个因素会影响人的血液中胆固醇的含量，它们是抽烟、饮酒和运动。 如果上述断定为真，则以下哪些项一定为真 Ⅰ．某些生活方式的改变，会影响一个人患心脏病的风险。 Ⅱ．如果一个人血液中的胆固醇含量不高，那么他患致命的心脏病的风险也不高。 Ⅲ．血液中的胆固醇高含量是造成当今人类死亡的主要原因。
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