二．单项选择题。（每小题1分，共20分）
21. Anderson ___________ in bed at the moment.
A. lie B. is lieing C. is lying D. lies
22. Guangzhou, my hometown, is ___________ of China.
A. in the north B. in the south C. to the north D. to the south
23. --- __________ is the river?
--- It’s about 1,700 kilometres.
A. How far B. How tall C. How many D. How long
