Is there life on Mars(火星)?We do not know.We are sure that ea

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Is there life on Mars(火星)?We do not know.We are sure that earth people like us cannot live on Mars.Earth people need oxygen（氧气）to breathe(呼吸),but there is almost no oxygen on Mars.
Living on Mars is like living on a very high mountain.
There is little air on it.It is 50℃ about zero at noon and 100℃ below zero at night. Many people think there may be plants on Mars.We know that all plants and animals on the earth need carbon to grow.
Through a telescope(望远镜).Mars looks red.In some places it seems gray.At times the gray color turns gray-green,then brown,then gray again.The gray-green color may be a kind of plant life.It changes color with the seasons.
Will men go to Mars one day?If they do,they will have to take along their own oxygen,food,clothes and something to sleep in. 翻译

火星上有生命吗?我们不知道,但是像我们这样的地球人是没办法在火星上生存的,因为地球人需要氧气来供他们呼吸,而火星上几乎没有氧气.
生活在火星就像生活在很高很高的山上
那儿没有空气,白天中午气温-50℃而晚上午夜气温甚至能达到-100℃,许多人认为火星上可能有植物,我们都知道所有地球上的动植物都需要碳元素来维持生长
通过望眼镜,火星看起来是红色的,但还有某些灰色部分,有时这些灰色（部分）会变成灰绿色,然后变为棕色,最后又变回灰色.那些灰绿色的可能是某种植物,它随着季节变换颜色.
人类会不会在某一天登上火星呢?如果能去,他就必须带上他们自己的氧气,食物,衣服,和睡觉的设施

Is there life on Mars(火星)?We do not know.We are sure that ea We haven't known ____ there is life on Mars.A.that B.if C.wh There are many things we need to know that we do not learn a It's not what do we know that's important is who do we know. we are not sure. We are not sure() it is true that we do not know what we have got we lose it.选 it is true that we do not know what we have got until we los 英语翻译The question whether there is life on Mars (火星) has made NOVA IS THERE LIFE ON MARS怎么样改错：We are not sure that he will get here on time 这片英语阅读感激不尽There are many things we need to know that we do