加拿大高中生David在互联网上登出启事notice，希望结识一位中国朋友，以便学习中国的语言、文化。假设你是重庆实验中学的李华，请在看到这则启事后，用英文给David发出一封电子邮件。主要内容包括： ①. 你怎样得知他的愿望 ②. 你愿意成为他的朋友 ③. 你打算如何帮助他 ④. 你盼望他的回复 注意：词数：100词左右

A.People' s Growing Interest in Natural Foods

B.Natural Foods and Healthy Diet

C.Harmful Effects of Sugar

D.The Importance of Fiber in Foods

A.people need sugar to give them energy

B.sugar is bad for the health

C.the use of sugar is habit forming

D.sugar only sweetens food, but provides us with nothing useful

A.they are fed on food which is little better than garbage

B.they live in very crowded condition

C.the eggs they lay lack vitamins

D.they are allowed to move about and eat freely

A.has had chemicals and fertilizers added to it

B.contains vegetable matter that has not been consumed

C.has been nourished by fertilizers

D.already contains large quantities of vitamins and minerals

A.they are more health conscious

B.they want to taste all kinds of foods

C.natural foods are more delicious than processed foods

D.they want to return to nature

A.Fire can help people in many ways.　　B.Fire can be both helpful and dangerous.

C.Fire can burn things and people.　　D.We must be careful with matches.

A.will die 　　B.will warm our houses

C.might burn us 　　D.won' t help us

A.must be careful　　B.should keep air away from it

C.must know it is dangerous　　D.should cover it with water

A.matches burn paper 　　B.it isn' t interesting

C.they can be dangerous 　　D.they can burn a house

A.Not everybody knows how people began to use fire.

B.Nobody knows how to make a fire.

C.It is an Australian who started a fire.

D.We are not sure how people began to use fire.