题目

（2010·安徽合肥高三第一次教学质量检测） 27. When astronauts return to the earth's atmosphere, helicopters fly to          ______they would land, ready to collect them. A. what    B. where        C. which        D. that 答案：BI usually go to school _____. [     ]A. ride the bike      B. on bike C. on the bike       D. by my bike