经典谜语四则，猜猜我是谁
No.1
I am from China.
I have a fat body.
I am black and white.
What am I?
No.2
I say “hello” and “how are you?”.
I help doctors.
I help sick people.
What am I?
NO.3
I am long.
I am yummy.
Chinese people eat me on their birthdays.
What am I?
NO.4
I am small.
I am good friends of your eyes.
I help you see well.
What am I?