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

165. _____ made the school proud was _____ more than 90% of the students had been admitted to key universities. (2003上海春)

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

164. York, the first city _____ in Australia last year, is a nice old city.

　 A. that I visited　　　　 B. which I visited　　　　　 C. where I visited　　　　　 D. in which I visited

163. York, _____ last year, is a nice old city.　 (2003北京)

　 A. that I visited　　　　 B. which I visited　　　　　 C. where I visited　　　　　 D. in which I visited

162. _____ has been announced that we shall have our final exams next month. (2003上海春)

　 A. That　　　　　　　　　　 B. As 　　　　　　　　　　　　　 C. It　　　　　　　　　　　　　　 D. What

161. _____ has been announced, we shall have our final exams next month. (2003上海春)

　 A. That　　　　　　　　　　 B. As 　　　　　　　　　　　　　 C. It　　　　　　　　　　　　　　 D. What