21. My aunt lives in _________ A-shaped house near the river. It is _________ 20th century cottage.
A. the; 不填 B. an; the C. 不填; the D. an; a
22. With more and more forests being destroyed, huge quantities of good earth _________ each day.
A. are being washed away B. is being washing away
C. is being washed away D. are washing away
