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To share opinions about space travel.
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To master usages of present perfect with already, just and yet.
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To cooperate to debate properly.
Mars
Probes
Mars appears red because of iron oxide(氧化铁), or rust(铁锈), in its soil.
Like Earth, Mars has ice caps at its poles.
The surface of Mars is a little like the surface of Earth.
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Listen & Read
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Listening and vocabulary
Listen and number the words as you hear them.
earth □ land □ message □
moon □ news □ planet □
reach □ scientist □
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Listening and vocabulary
Listen again and complete the notes.
? news about the trip to (1) _________