用高倍显微镜观察黑藻叶片细胞，正确的结论是

自习课上,大家都在认真做作业,唯有小雨和小倩在闲聊,而且说话声音很大。纪律委员要求他们安静点,可他们却认为这伤害了他们的自尊。

小雨和小倩的认识正确吗?为什么?

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或者使用括号中词语的正确形式填空。

Mr Jones had a few days’ holiday, so he decided to go on a trip. He put  ____ his best clothes, took a small bag, ____(go) to the train station and got on the train. He had a 18. ____(beauty) hat, and he often put his head out of the window ____(see) the mountains during the trip. Suddenly, the wind  ____(blow) away his hat.

  Mr Jones  ____(quick) took his bag and threw it out of the window.. ____(other) on the train laughed and said, “Is your bag going to bring your hat  ____?”

  “No,” Mr Jones answered, “but there is no name or address on my hat, and there ____(be) a name and ____ address on the bag. Someone will find both of them, and he will send the bag and the hat back to me.”

读图，判断句子对错，并修改：

What's this？It's a bird. ____