题目

以下说法不正确的是（    ） A．雄性动物从初情期开始产生精子        B．1个精原细胞可形成4个精子 C．哺乳动物精子的发生是在睾丸内完成的  D．动物体型大的产生的精子多且大 答案：D阅读下面短文，根据短文内容用方框内所给词语的适当形式填空，使短文语义完整。(请你一定要注意词语的形式变化!) to   must   ask   unusual   it   when   early   who   notice   if My name is Jim White. I live in America. I had a very   1.   experience on Sunday. I saw a UFO in the daytime.   2.   this spring, I went outside with my friend Bill  3.  lived close to me. We were walking to a hill  4.  I saw a large bright light dancing in the sky. I called Jim and asked him to look up. He kept  5.  , “What is that?” “A UFO!” I shouted excitedly. I 6.  it was round and red in the center.  After we looked at 7.  for a moment, we found it seemed that it had wings, but it was still round. Bill would not believe me when I told him it  8.  be a UFO. We shouted  9.  it and we wished that it would land. We wanted to know  10.  there was an alien in it. But soon it disappeared. I guessed we scared it off. Do you believe me? It’s a true story.