道路货物运输经营者应当采取有效的措施，防止货物脱落、扬撒等情况发生。
参考答案：对
I went to bed early, but I left my bedroom lamp on ______ my parents think I _______.
A．making; would study
B．to make; was studying
C．to make; had studied
D．making; had been studying
4月20日晚在中央电视台“情系玉树，大爱无疆--抗震救灾大型募捐活动特别节目”．据统计，这台募捐晚会共募得善款21.75亿元人民币．用科学记数法表示为______元人民币．
