判断下面句子是否正确,（T、F）
1.Lu Yun is the oldest in our class.So she's the tallest.( )
2.Elephants are the biggest animals on land.Their noses are the longest in the world.( )
3.The first month in a year is January and the last one is November.( )
4.Autumn is the hottest season in a year.( ）
5.Beijing is the biggest city in China.( )
6.Changjiang is the longest river in the world.( )
7.Canada is bigger than China.( )
8.There are more people in China than in America.( )