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：                                                                                                                                 

与单细胞藻类相比，草履虫没有的结构是（ ）                              

①细胞质 ②液泡 ③细胞核 ④细胞壁  ⑤细胞膜 ⑥叶绿体

A．①③⑥

B．②④⑥

C．①④⑤

D．②③⑤