艾滋病可以母婴传播，所以艾滋病是遗传病．

C

    O. Henry was an American writer. He wrote lots of short stories. His real name was William Sydney Porter. He was born in North Carolina in 1862. As a young boy, he lived an exciting life. He did not go to school for a long time, but he learned everything he wanted to know. When he was about 20 years old, O. Henry went to Texas. There he did different jobs. He first worked in a newspaper, and then he has a job in a bank. When some money went missing from the bank, O. Henry was suspected (被怀疑）. Because of that he was sent into prison（监狱）. During the three years in prison, he learned to write short stories. After he got out of prison, he went to New York and continued writing. He wrote mostly about New York and the poor life there. People liked his stories, because although simple(简单), to the reader's surprise, the stories would finish with a sudden change at the end.