The river is very long and it is about. A. 20 metres wideB. 15 metres longC. 30 metres hig

问题补充：

The river is very long and it is about.

A. 20 metres wide

B. 15 metres long

C. 30 metres high

D. 50 metres tall

答案：

(答案→)A. 20 metres wide

B. 15 metres long

C. 30 metres high

D. 50 metres tall

解析：考查句意理解。题干提供了long这个解题关键。此题只要读懂题目即可。