如图，AD是⊙O的直径，AB为⊙O的弦，OP⊥AD，OP与AB的延长线交于点P，过B点的切线交OP于点C.

罗马共和国时，谁能够发言，何时能够发言，都有严格的规定，贵族始终在平民之前。这体现了当时罗马政治的（    ）

某市某幼儿园六一期间举行亲子游戏，主持人请三位家长分别带自己的孩子参加游戏，主持人准备把家长和孩子重新组合完成游戏，A、B、C分别表示三位家长，他们的孩子分别对应的是a、b、c．

（1）若主持人分别从三位家长和三位孩子中各选一人参加游戏，恰好是A、a的概率是多少（直接写出答案）

（2）若主持人先从三位家长中任选两人为一组，再从孩子中任选两人为一组，四人共同参加游戏，恰好是两对家庭成员的概率是多少．（画出树状图或列表）

阅读理解
    Different weather makes people feel different．It influences health，intelligence and feelings．
    In August，it is very hot and wet in the south the US．People there have heart trouble and other kinds of health problems during this month．In the Northeast and the Middle West，it is very hot in the summer and very cold in the winter．People in these states have more heart trouble after the weather changes in February or March．
    The weather can also influence intelligence ． For example，in a 1983report by scientists，IQ(智商)of a group of students was very high when a very strong wind came, but after the strong wind,
    Their IQ was 10% lower than before. The wind can help people have higher intelligence. However,very hot weather can make it lower. Students in many schools of the US often get worse in exams(考试)in the hot months of the year(July and August).
    Weather also has a strong influence on people's feelings．Winter may be a bad time for thin people．They usually feel cold during these months．They might feel unhappy during cold weather．But fat people may have a hard time in hot summer．At about 18℃people become stronger．Low air pressure may make people forgetful．People leave more bags on buses and in shops on low-pressure days．
    Are you feeling sad，tired，forgetful，or unhappy today？It may be the weather's problem．

用如图所示的实验装置观察光的薄膜干涉现象．点燃酒精灯并在灯芯上洒些盐，竖立着一层肥皂液薄膜的金属丝圈．下面说法正确的是（   ）