问题补充：
The Yellow River isriver in China.
A. the second long
B. the second longest
C. the two long
D. the two longest
答案：
A. the second long
(答案→)B. the second longest
C. the two long
D. the two longest
解析：“the+序数词（second，third）+形容词最高级”表示“第几大/长……”
