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   What do you know about Mars? What does it look like?

Mars is the fourth planet from the sun in our solar system and is ___________ after Mars, the Roman god of war.___________ diameter(直径) is 53% as ___________ as that of the earth. Mars goes around the sun at a distance of about 228 million kilometers. You can tell ___________ planet is Mars because it is bright red in the night sky. It ___________ like a red and orange ball. It’s very beautiful. But during spring and summer, the surface of Mars is covered ___________ strong storms. The gravity on the surface of Mars is about ___________ as strong as it is on earth. So a person who weighs 90 kilos on earth weighs only 36 kilos on Mars. The temperature on Mars is ___________ -138℃ and 28℃. The air has only 0.13% oxygen.

It takes a spaceship about eight months to ___________ Mars from the earth when the two planets are ______________ to each other. Scientists are still searching for more information about Mars.