The speaker’s reason for changing his opinion was highly pertinent.

A. imaginative
B. unrealistic
C. relevant

D. controversial

选出填入下列空白处最恰当的一项是：（ ）

.天山绵延几千里，不论高山、深谷，不论草原、森林，不论溪流、湖泊，处处有丰饶的物产，处处有（　　　）的美景。

A．美丽

B．奇丽

C．艳丽

D．绚丽