当黑龙江还是冰天雪地，海南岛已春暖花开，这种南北气候差异的主要原因是[ ]
A、地势起伏大
B、跨纬度广
C、跨经度广
D、地形复杂
答案：B
Last year, a certain public transportation system sold an average (arithmetic mean) of 41,000 tickets per day on weekdays (Monday through Friday) and an average of 18,000 tickets per day on Saturday and Sunday. Which of the following is closest to the total number of tickets sold last year ？（）
A.1 million
B.1.25 million
C.10 million
D.12.5 million
E.125 million
以下属于国内特快专递邮件禁止寄递物品的是（）。
A.保鲜袋
B.衬衣
C.烟花
D.帽子
