--How much ________ this pair of trousers? - Ten dollars _______ enough.

A．are, is

B．is, are

C．are, are

D．is, is

“石固金汤拦碧海，门流玉液济苍生”，描绘的是浙江省（）水库。

A.里石门

B.富春江

C.周公畈