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_______ ﹤ ______ ﹤ _______ ﹤ ______
Japan France Australia China
planet, galaxy, star,
universe, solar system,
______ ﹤ _____ ﹤ ______ ﹤ ______ ﹤ ______
planet
star
solar system
universe
galaxy
The solar system is a small part of the galaxy.
The Sun and other planets are called the solar system.
The Sun is a star.
The Earth is a planet.
The galaxy is a small part of the universe.
1.Have we ever been to the moon?
2.Have we ever been to the Sun?
3.How many planets have we found
in the solar system?
4.Have we ever gone beyond the moon?
5.Have we found life on other planets
yet?
Discuss with your deskmate, ask and answer.
We haven’t found life on other planets yet.
The title may help you think of some of the key words in the passage.（根据题目，选择可能会在文章中出现的词汇。）
scientist
spacecraft
environment
earth
grammar