题目

Many of us think, wrongly, that the moon doesn't change. For example, the Tang Dynasty poet Zhang Ruoxu once wrote that “Generations have come and passed away; From year to year the moons look alike, old and new.\” However, a new study published in the journal Nature Geoscience shows that the moon is in fact slowly shrinking over time. For the study, a group of US scientists examined and analyzed thousands of photographs taken by the NASA's Lunar Reconnaissance  Orbiter  Camera (月球勘测轨道飞行器照相机). They found that there were lots of faults (断层) on the surfa中央二台经济生活频道，在主持人马斌主持的“购物街”栏目中，有一个幸运转盘游戏。该游戏规则是这样的：一个木质均匀的标有20等分数字格的转盘（如图），甲、乙两名人选观众每人都有两次转动盘的机会，转盘停止时指针所指的两次数字之和为该人的得分，但超过100分按0分记；且规定：若某人在第一次转动后，认为分值理想，则可以放弃第二次机会，得分按第一次所指的数记，两人中得分多者为优胜。游戏进行中，第一名选手甲通过一次转动后，指针所指的数字是85，试回答以下问题：    （Ⅰ）如果甲选择第二次转动，求甲得0分的概率；    （Ⅱ）如果甲放弃了第二次机会，求乙选手获胜的概率.