读下图,回答下列各题:(12分) (1)一月我国漠河与海南岛南部温差为 ,据图说明冬季我国温度的分布特点及其成因(5分) (2)一月0°C等温线主要位于我国 地区,它同时也是我国 气候和 气候的分界线。(3分) (3)C地等温线向 凸,其温度明显 (高于或低于)西侧地区,原因是 English has a large (词汇) with different usage so it's not easy for a Chinese person to speak English as (流利地) as a native English speaker.