Duncan, _____ NBA star, is one of ______ few basketball players who are very popular to many

of his Chinese fans. [      ]

A. an; the

B. an; a

C. the; the

D. the; a

将下列大洲的分界线，用直线连接起来：

A亚洲、欧洲a苏伊士运河

B亚洲、非洲b乌拉尔山脉、乌拉尔河、大高加索山脉、土耳其海峡

C亚洲、北美洲c巴拿马运河

D北美洲、南美洲d白令海峡．