看图填词，这是一张请假条，请根据图示,在空格处填入适当的词，使其意思完整、正确。

Dear Miss Wise,

      I'm sorry that I can't go to school today. I had an accident and my 1_____  arm is hurt. This morning

I got up at 2_____   past six. While I was putting on my. 3_____, I found it was 4_____  outside. After I had

breakfast, I rode to school. At the crossing near the 5_____  before I turned 6_____, I looked 7_____  and

found there was 8_____  traffic behind me. But just then a 9_____. was running very fast towards me. I tried

to stop but there was water on the street. So I 10_____  on the road and hurt my arm. The man on the other

bike sent me to the hospital nearby. The doctor told me to rest for a month. So I have to ask for a month's

leave. Thanks.

                                                                                                                                   Yours sincerely,

                                                                                                                                    Mike

关于抗感染免疫的叙述，下列错误的是（）

A.完整的皮肤与粘膜屏障是第一道防线

B.吞噬细胞和体液中的杀菌物质是第二道防线

C.体液免疫主要针对胞外寄生菌的感染

D.细胞免疫主要针对胞内寄生菌感染

E.抗体与细胞结合可直接杀死病原菌