177. As a result of destroying the forests, a large _____ of desert _____ covered the land. (2001上海)
A. number; has B. quantity; has C. number; have D. quantity; have
176. _____ of the people working here _____ from northern part of China.
A. Two fifth; is B. Two fifth; are C. Two fifths; is D. Two fifths; are
175. _____ of the land in that district _____ covered with trees and grass. (2000上海)
174. All these means _____ to prevent the air pollution, but the sky is still not clear.
A. is used B. are used C. has been used D. have been used
173. Every possible means _____ to prevent the air pollution, but the sky is still not clear. (2000上海春)
172. Along with the letter was his promise about _____ we were all eager to know.
A. which B. that C. what D. whether
171. Along with the letter was his promise _____ he would visit me this coming Christmas. (2004上海春)
170. The other day, my brother drove his car down the street at the highest speed ______ I have never seen.
A. as B. which C. what D. that
169. The other day, my brother drove his car down the street at _____ I thought was a dangerous speed. (2004上海春)
168. It is pretty well understood _____ the earth goes around the sun.
A. that B. when C. what D. how