题目

阅读短文，从每题所给的四个选项（A、B、C、和D）中，选出最佳选项.Conflict is on the menu tonight at the café La Chope. This evening, as on every Thursday night, psychologist Maud Lehanne is leading two of France's favorite pastimes, coffee drinking and the “talking cure”. Here they are learning to get in touch with their true feelings. It isn't always easy. They customers - some thirty Parisians who pay just under $2 (plus drinks) per session - care quick to intellectualize (高谈阔论)，slow to open up and connect. “You are forbidden to say ‘one feels,7．已知等差数列{an}满足：a4=9，a5+a7=26，数列{an}的前n项和为Sn．（1）求an及Sn；（2）设{bn-an}是首项为1，公比为2的等比数列，求数列{bn}的前n项和Tn．