Bộ thú huyệt cũng có lông mao và nuôi con bằng sữa => Xếp vào lớp thú.

Hok bn =) xếp zui hong đc nha.

Our planet is rapidly polluted, and the population is growing. So one day the Earth won't be our home. Then we either go to the Moon or Mars. The right choice is the Moon! Here we will build as on Earth, but they will become more modern. People will create an artificial sun and an artificial atmosphere. Plants will grow, and forests will be a lot more than what we have on Earth. Humans won't use anything to operate on fossil fuels, it helps that our new house isn't like Earth. On the other hand, I think the moon is smaller than the Earth, so it's not going to be our home until 50 years later because of population growth. If people can't plan anything for the future of the world, there will be an increasing population, which means more houses. Therefore, the moon could not be our house anymore.
Đây a tự gõ, e học tốt nha :D.

An is the tallest pupil in our class.

D

C

C. Dịch vụ

Lỗi ảnh, mak nếu là hình 53.1 sgk thì B đúng.

I) 1. Cậu đúng r nhưng nên bỏ "by us"
2. ours mới đúng nha
II) 1. Solar energy will be used by many countries in the world
2. How will you travel from one place to another?
3. We will reduce the use of electricity to save our energy.
4. There are always traffic jams during rush hours.
Chúc học tốt :>>