题目

Smart Kids Festival EventsSmart Kids is a collection of one hundred events scheduled in October. This year, it is experimenting with Pay What You Decide (PWYD). That is, you can decide to pay what you want to or can afford, after you have attended an event. You can pre-book events without paying for a ticket in advance. Here are some of the director’s picks.Walk on the Wild SideNot ticketed, FreeJoin storyteller Sarah Law to hear science stories about animals. Along the way you’ll meet all sorts of beautiful creatures and discover life cycles and food chains. Best suited to children aged 5在探索地球上生命的起源活动中，美国科学家米勒(S．Millte)做了一个著名的实验，他模拟原始大气的成份将甲烷、氨、氢和水蒸气混合，放入真空的玻璃仪器中进行实验。一个星期后，他惊奇地发现仪器中果然有数种氨基酸生成。你从米勒的实验中能得出的结论是（   ） A. 一定发生了化学变化                   B．没有发生化学变化 C. 无法判断是否发生了化学变化           D．一定没有发生物理变化