题目

Mohamed ElBaradei finally announced ___________ people __________have been watching Egypt's political transformation had long thought.  【黑龙江省哈市五县2011年高考模拟试卷英语卷（22）】【名词性从句】                                              A. why, that     B. that, who    C. what, who     D. how, who   答案：C考查名词性从句和定语从句。第一空what作thought的宾语中；第二空who引导定语从句，修饰people。  某人站在正对着悬崖行驶的船上对着远处悬崖高喊一声，经过2s后听到回声，若船行驶的速度是5m/s，空气中的声速是340m/s，问人听到回声时，船离悬崖多远？