初三的英语同义句(1)Problem hair is often a result of an unhealthy di

初三的英语同义句
(1)Problem hair is often a result of an unhealthy diet and lifestyle.
(1)The food on the plane is free to the passengers.
可否改成:
Problem hair is often caused by an unhealthy diet and lifestyle.
The food on the plane is to the passengers free of charge.