最好说明理由哦2.To protect the environment is necessary【该为同义句】-----

最好说明理由哦2.To protect the environment is necessary【该为同义句】----- to protect the environment is our duty 同义句 To protect the environment is important.(改为同义句) We should try to protect the environment同义句 We should()()()t what can we do to protect our environment?同义句 I think that it is necessary in protect the environment.用英语怎 to,is,our,it,duty,protect,environment,the,连词成句 to protect environment还是the environment 为什么? How to protect the environment It is our duty to protect the environment it is our duty to protect the environment. It is necessary to protect trees from the frost.