题目

选择合适的单词，并用适当的形式补全短文。turn post office next to his getI have a friend. ____________ name is Mike. Next Sunday is his birthday. I’m going to send him a postcard. So I’m going to the ___________this afternoon. It’s _________ the museum. I will take the No.25 bus. And _______ off at the shoe store. Then _______ left and go straight. I will see the post office.假如有一双链DNA分子的鸟嘌呤占整个DNA碱基的27％，测得这个DNA分子一条链上的腺嘌呤占这条链碱基的28％，那么另一条链上的腺嘌呤，占该链碱基的比例是 A．9％           B．18％   　　　　C．23％          D．24％