(2013·宁夏银川一中高三第四次考试)Each of the 400 people received from their boss ________ gift—“Who moved my cheese？”， ________ best­seller in the US, which helped them understand how to deal with changes in their lives and work.

A．the; /

B．a; /

C．a; a

D．the; a

王老师想购买一套住房，现已在某小区选中一套98平方米的房子，单价是每平方米2500元．如果一次付清房款，房价可以优惠5%，现有20万元，能买下这套房子吗？（计算后回答）