题目

写一篇建议信，建议信的内容有 ： 李华是一个17岁的高二女孩，体重70公斤。喜欢吃肉，不喜欢运动。而且经常感冒，所以她很苦恼。假如你是她的好朋友，给她写一封信提出你的解决办法或建议。 答案：I am sorry to hear that you have been ill for days and hope you have got better now. You have studied so hard that you have had no time for exercise. This is harmful for your health. I feel it would be more beneficial to your health if you could take more exercise in future. Exercise can improve your physical constitution and refresh the mind. After one or two hours of exercise you can stud20．下列基因型的生物个体中，属于纯合子的是（　　）A．AaBbB．AabbC．aaBbD．aabb