题目

In many shops the ___35___  has to wait for someone to serve him.And when ___36___  some clerk does notice you, you are made to feel as if you were interrupting him.Either he is ___37___  in deep thought in which he hates to be disturbed or he is chatting with a girl clerk and you feel like ___38___ for being too rude. He shows no interest either in you or in the goods he ___39___  to sell. Yet possibly the very clerk who is now so indifferent(冷漠的) began his career with hope and ___40___. The daily work was too much for him; the newness disappears slowly; his only pleasures w某实验室一天的温度（单位：）随时间（单位：）的变化近似满足函数关系；.（1）求实验室这一天的最大温差；（2）若要求实验室温度不高于11，则在哪段时间实验室需要降温？