Listen to 1a and answer the questions.
(1) What docs Mars look like?
It looks like a red and orange ball.
(2) How far is Mars from the sun?
It's about 228 million kilometers away from the sun.
(3) What's the temperature on Mars?
It is between -1389Cand 28%C.

Language Points
1. Its diameter is 53% as wide as that of the earth.它的直径是地球直径的53%。
2. The gravity on the surface of Mars is about two-fifths as strong as it is on earth.火星表面的引力大约是地球引力的五分之二 。
倍数(分数)+ as +adj.+as ....的几倍
3. Mars goes around the sun at a distance of about 228 million kilometers.火星在距太阳约228 000 000千米处环绕着太阳转。
at a distance of .....距离