房地产租赁业务是房地产经纪人主要业务之一。租赁房屋的承租方对房地产经纪人而言，客户群具有( )。

A．集中性

B．适应性

C．固定性

D．很大的流动性

—Excuse me, where is the nearest bookshop, please
—Sorry, I don't know.
—______.

A．You're welcome

B．Thank you all the same
C．I'm sorry to hear that

D．Thanks a lot