Question

There is _____ river at the foot of the mountain(山). _____ river is dangerous.

A．a; A

B．a; The

C．the; The

D．the; A

Answer 1

B  

            
试题分析: 句意：山脚下有一条河，这条河很危险。不定冠词a用于泛指，表数量一个，定冠词为特指。每一次提及某事物用不定冠词，再次提及用定冠词强调，根据there is 可知主语为一条河，故答案选B.