广义的传播学以人类（）为研究对象。A、社会 B、一切传播行为 C、心理 D、信息交流

按要求写句子。  

(1)我们不能被困难吓倒。

    改为反问句：                                                                                                                             

(2)小溪流向远方。 

    改为拟人句：                                                                                                                             

(3)难道你愿意让人嘲笑吗？ 

    改为陈述句：                                                                                                                             

(4)听了这个故事，在场的人都深受感动。

    改为否定句：                                                                                                                             

(5)请你用一句名言鼓励同学们刻苦学习，永攀科学高峰。

(6)大雁塔、兵马俑和西安动物园是中外游客向往的古迹。 

    修改病句：                                                                                                                                 

已知2x-y=4，求4x²-4xy+y²-2x+y-6的值．

My son found             interesting to play chess, so he asked me to teach him. [ ]

A. it

B. that

C. its

D. this

怎样提高生鱼片食用安全？

组成微型计算机“主机”的两个主要部件是微型处理器和( )。

A．硬盘

B．软盘

C．光盘

D．内存储器