第三节One possible version:Children are widely exposed to alcohol and thus have amisunderstanding of it very early. However, without realizing the problem, parents don' t pay enough attention to it.Unluckily, according to research, teenage drinking is veryserious in North Dakota, which might result in variousproblems. Since children and teenagers tend to ask theirparents for guidance in making decisions, it s parentsuty to communicate with children about alcohol in time.

8.B【解析】命题“若a+b≠5,则a≠2或b≠3的逆否命题为“若a=2且b=3则a+b=5”,其逆否命题为真命题,①正确;命题“若x=2,则x2-2x=0”的逆命题为“若x2-2x=0,则x=2”,其逆命题为假命题,因为x还有可能等于0,故否命题也为假,②错误;因为saz+cosz=gin(x+)≤,命题p为真命题,则一p是假命题,③正确;已知平面a上不共线的个点到平面B的距离相等,若这三个点中,两个点在平面P的一侧,另一个点在平面的另一侧,则a与β不平行,④错误;根据面面平行的判定定理,得p是q的必要不充分条件,⑤错误故选B.

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