—It is the first time that I ________ here in Hong Kong.

—What great changes！It’s ten years since I ________here last time.

A．have been；came

B．have been；have come

C．am；came

D．was；have been

图中100°E以东，120°E以西，40°N以北的我国范围内最主要地形区的特征是（　　）

A．等高线密集，所以地形陡峭

B．等高线密集，所以地形坦荡，起伏小

C．等高线稀疏，所以地势平坦，起伏和缓

D．等高线稀疏，所以地表崎岖不平，起伏大