we take harmful gas from the air and g(----) off oxygen

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• 英语题目.速回答1.The ___the air is from the ground ,the ___the air is ( )A higher up ;thinner B.lower ;thinner C higher up;denser 2.What gas is give off when an object is burnt ?( )A.Carbon dioxide B. Oxygen C.Hydrogen 3.Which statement is wrong ?( )A.Plants are important to life .B .Animals and man cannot live without plants .C. Plants can make food only from air and water .
• Trees take in harmful gases from the air ang produce oxygen for us to breathe Trees_____ turnharmful gases from the air ______ oxygen for us to breathe.英语学案上的题
• trees take harmful gas from the air 提示：take sth from=get rid of
• （二）、阅读短文,判断正（T）误（F）I used to travel by air a great deal when I was a boy（二）、阅读短文,判断正（T）误（F）I used to travel by air a great deal when I was a boy.My parents used to live in South America and I used to fly there from Europe in the holidays.A flight attendant would take charge of me and I never had an unpleasant experience.I am used to travelling by air only on one occasion have I ever felt frightened .After taking off,we were flying low over the city an
• Trees take in harmful gases from the air ang produce oxygen for us to breathe Trees_____ turn
• we take harmful gas from the air and g(----) off oxygen
• 完型填空 I often travelled by air when I was a boy .My parents lived inI often travelled by air when I was a boy .My parents lived in South American at the time ,so I often had to ___1___ there from Europe during the holidays .An air hostess on the plane would take ___2___of me and I never had an unpleasant experience ___3___ one time .I was really ___4___ at that time .After taking off ,we flew low ___5___ the city and slowly gained height (爬升).But the p
• 把以下句子变为一般疑问句和反问句：Trees help us in many ways.Trees keep the air cool and clean.They take in harmful gasses from they air.They are major fighters against air pollution.I know trees make our lives more convenient.Many of the things in our daily lives come from trees.Tea comes from the leaves of trees.A lot of furniture is made of wood.I can imagine a world without trees.We should stop doing this.
• ln the cities,there are a great many people,and there are too many cars running on the road.……The gas from the car is full of poison.Every day we breathe(呼吸）it in and o___.This makes us feel sick.Because so many cars,there are many f_____,too.They give off(发出）b______ or grey smoke .This kind of smoke is poisonous,and is harmful(有害的）to our h______.So in order to keep us healthy,we must take a_____ to fight pollution.
• Burning gas ,oil and coal creates air pollution
• 汽车的外轮直径是0.75米,如果它行驶时车轮每分钟转400圈,这辆汽车每分钟大约行多少?