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第87页

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 Happy people.

 For about 85 years.

 Yes, they are.

C.

 buy happiness

I think life on Mars is more comfortable and more interesting than that on the Earth. We have online

schools instead of real ones. We have lessons, do our homework, take exams and talk to teachers and

classmates through the computer connected to the interplanetary network at home. It's not very crowded

here so we have more space to live in. Most of our housework is done by robots so that we can have more

time for our hobbies. Mars is very beautiful. There are green trees and pretty flowers everywhere, and

there is no pollution here. We have supermarkets in our neighbourhood. They make our life more

convenient.