A:调节作用
B:运输作用
C:免疫作用
D:遗传信息的载体
Mary spends two hours her homework every day.
注意:1)词数100左右;
2)可以适当增加细节,以使行文连贯;
3)开头和结尾已给出,不计入总词数。
Dear Kenton,
I am looking forward to your reply.
Yours sincerely,
Li Hua