问题补充：
单选题Whenaskedwhyheprefersbikestobuses,theprofessorsaid,“Ridingabicycletakes__________halfanhour,butit’smoreconvenientandenvironmentallyfriendly.”A.absolutelyB.accuratelyC.approximatelyD.exactly
答案：
C解析考查副词辨析。absolutely 绝对地 accurately 精确地 approximately 大约exactly恰好，正是 根据句意：骑自行车需要花费大约半小时，但更方便更环保。
