简述病毒免疫逃逸的机制

“人多力量大”、“众人拾柴火焰高”，这些名言证明了人口的增加是有利于社会发展的。
上述推断的主要缺陷在于：

A．“人多力量大”肯定了人力资源的作用，是重视人才的表现。

B．不同的人对社会的贡献是不一样的，应当指明主要应增加哪一类人口。

C．名言并非真理，不能由名言简单地证明上述结论。

D．人口越少，消耗掉的社会资源就越少。

E．人口越多，带来的社会问题越多。

缺词填空。

Dear Editor,

      I am a r__1__ of your magazine and I need help. I am very u__2__ these days b__3__ I have some

problems with my new school.

      I am a G__4__ 8 student. I lived in Jiangsu but I just moved to Shanghai with my p__5__ .Now , I

am studying at a new s__6__ school in Shanghai.

      I do not know the school very well and I have n__7__ friends here. I do not know how to t__8__to

my classmates. Sometimes, I am uncomfortable when they talk to me . During lunchtime, I always sit a

___9___ in the playground and read books. I hope they will not come and talk to me.

    I m__10__ my classmates from my o__11__ school very much. I do not know what I can do now. I

hope you can give me some a__12__.

根据功能，多媒体设备可以分为音频设备、视频设备等。

我国最早的散文是（）。

反思建国以来的教育历程，我们可以得到哪些规律性的认识。