《论语》是儒家经典著作，想知道它被收入到哪些丛书之中，可以查找（）。
参考答案：中国丛书综录
Hi Mr. Smith. I didn't know you were in New York. How long _________ here? [ ]
A. have you come
B. were you
C. have you been
D. will you come
与离心式通风机相比，动叶可调的轴流式通风机优点包括（）。
A．流量较大
B．使用范围较大
C．风压较高
D．经济性能好
