175. _____ of the land in that district _____ covered with trees and grass. (2000上海)

A. Two fifth; is　　　　　　 B. Two fifth; are　　　　　 C. Two fifths; is　　　　　　 D. Two fifths; are

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)

A. is used　　　　　　　　　　　　　　 B. are used　　　　　　　　　 C. has been used　　　　　 D. have been used

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)

A. which　　　　　　　　　　　 B. that　　　　　　　　　　　　　 C. what　　　　　　　　　　　　 D. whether

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)

A. as　　　　　　　　　　　　　　 B. which　　　　　　　　　　　 C. what　　　　　　　　　　　　 D. that

168. It is pretty well understood _____ the earth goes around the sun.

A. that　　　　　　　　　　　　　 B. when　　　　　　　　　　　 C. what　　　　　　　　　　　　 D. how

167. It is pretty well understood _____ controls the flow of carbon dioxide in and out the atmosphere today. (2003上海)

A. that　　　　　　　　　　　　　 B. when　　　　　　　　　　　 C. what　　　　　　　　　　　　 D. how

166. _____ more than 90% of the students have been admitted to key universities is _____ the school takes pride in.

A. What; because　　　　　 B. What; that　　　　　　　　 C. That; what　　　　　　　 D. That; because