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Check (√) the true sentences.
×
√
√
4. The light from the stars in other galaxies has travelled for a long time to reach us.
5. Scientists have received many messages from space.
6. Spaceships have visited most of the universe.
√
×
×
1. Scientists think that there has been
life on Earth for millions of years.
① 宾语从句
② there has been: there be 的完成时
科学家们认为，
地球上已有生命数百万年了。
Read Para 1 and find out this sentence.
They think _________________ (曾有过)
life on the moon.
用现在完成时
there be
has ever
been
Read Para 2 and answer questions:
1. What does the Earth go around?
2. What is the solar system?
It goes around the sun.
The sun and its planets are called the solar system.
围着……转
2. None of them has an environment with air. (L3-4)