推销员除了要负责为企业推销产品外，还应该成为顾客的顾问。（）
参考答案：对
In our school there ______ a number of books on science and the number of them ______ growing larger and larger.
A．is; are
B．are; is
C．are; are
D．is; is
硬糖的返砂
