In our school library, there       a number of books on science and the number of the books        growing larger and larger.

A．is, are

B．are, is

C．have, is

D．are, are

银行存款有两个计算公式：①利息=本金×利率×期数；②本利和=本金+利息．某人以2.5万元用2年期方式存入银行，两年期的年利率为2.25%，到期后国家要征收20%的利息税，他两年后实际可获利息 [ ]

A．450元

B．562.5元

C．900元

D．1125元