下列各项中，中外著名历史事件都发生在16世纪的是

请回答下列问题：

某同学按下表所示制成临时装片进行有关实验．

将上述各组实验材料按表中实验条件进行相关处理后，制成临时装片，放在显微镜下观察．分析回答：

（1）上述实验中需要的材料用具除显微镜外，还需刀片、镊子、滴管、吸水纸、____ 

（2）A组实验的目的是____ ，50%酒精的作用是____ 

（3）B组实验的X染液是____ ，显微镜下看到的线粒体呈____色．

（4）在C组实验中，要选取菠菜叶稍带些叶肉的下表皮，原因是____．

（5）在E组实验中，显微镜下看不到质壁分离现象，原因是____．

Dear Sir or Madam.

    One of the teachers at my school in New York tells me that your school has summer course. I am planning to go to Beijing next summer and would like to take a short one-month course.

    I am 18 years old and have been studying Chinese for six years. I was born in the USA and have never been to China before. I am going to study Chinese at the university. I think the course will help me improve my Chinese.

    Could you send me a catalogue(目录) and application form (申请表)? I would also like information about Beijing and other places nearby. I hope to do some travelling when the course is over.

    Thank you! I am looking forward to your reply

Very truly yours,

Jim Green