A lot of students like collecting stamps.It is a popular hobby.We can also learn

A lot of students like collecting stamps.It is a popular hobby.We can also learn
about our country and foreign countries from stamps.There are a lot of interesting stamps.students like collecting the 12 Animal stamps.there is one stamp for each year so it
takes 12 year to collect all the stamps.some stamps are very valuable.this is the first stamp in the world.it is from England.its name is 'the penny black'.a lot of people want to collect want to collect this stamp.
1.What can students learn from stamps?答：
2.Why are the 12 Animal Stamps interesting?答：
3.What is 'the Penny Black'?答：
4.Why do a lot of people want to collect 'the Penny Black'?答：