On Mars,there is no pollution ___ by traffic.A is caused B caused C that caused D that are caused

Most scientists believe that there is no life on Mars as c____ there are very harsh NOVA IS THERE LIFE ON MARS怎么样 It is said that there will be no pollution______(cause）by traffic on Mars there is now considered to be no life on the Mars如何划句子成分 初二英文句子填空A:Some scientist ______(send) a spacecraft to Mars.And it______(reach)Mars.B:Really?What_____we_____(discover)?Is there life on Mars?A:No.We______(not find) any life on Mars yet. 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 white clond on mars的意思 On Mars,there is no pollution ___ by traffic.A is caused B caused C that caused D that are caused 同义句转换：There will probably be no schools on Mars.There will probably be no schools on Mars.(改为同义句)_____ there won't be _____ on Mars. There will probably be no school on Mars 同义句 There will probably ＿＿＿ ＿＿＿schools on Mars IV.单项选择.There,s( )water on Mars A.not B.no C.many 填适当的英语单词A:I don't believe we can live at Mars.B:Neither do I.Because the gravity on the surface of Mars is not so ______ as it is on earth.We can hardly stand still there.A:What's ______,there is no water. There will be no pollution on Mars,（）?A will it B won't itC will thereD won't there There is a shopping mall on Mars __(sell) different kinds of things from Earh. 我们还没有发现火星上有生命存在.We ()there is ()on Mars() There is some water left on Mars.的中文意思急用 Some scientists think there is water on Mars.(改为否定句） there is no boat on the l------.