题目

    阅读下面的短文，然后按照要求写一篇150词左右的英语短文。 Harland was only 5 years old when his father died.At  14，he quit school and started working on farms.At 16，he lied about his age and joined the US Army.After serving only one year as a soldier, he left and tried becoming a metal worker but he failed.Finally，Harland got a job working on a locomotive(火车头)and liked it.He thought he had finally found his place in life.      Harland married at 18.However，within months he was fired from his job and his wife left him.Over the next years可以用来组成人体免疫系统的结构或物质是( )①骨髓 ②扁桃体 ③淋巴细胞 ④抗体 ⑤红细胞 ⑥吞噬细胞A. ①③④⑤⑥B. ③④⑥C. ①②③④⑥D. ①③⑤⑥