据统计本地居民每天吸入灰尘及有害气体达到637000毫克,用科学记数法表示为______毫克.
将637000用科学记数法表示为6.37×105.
故答案为:6.37×105.
Lily and Lucy are twins and Lucy is ______ of the two. [ ]
A. old
B. oldest
C. the oldest
D. the elder