水电站发电时，水从高处向下冲击水轮机的叶轮，转动的叶轮带动发电机发电．在这个过程中，能量的转化顺序为（　　）

阅读短文，完成下列任务

　　The picture that sits on my desk in my bedroom is my favourite. (A)When I have trouble studying, or I’m worried about an exam, I always take a look at it. It is a picture of my best friends taken three years ago when we were in middle school. It reminds(使……想起) me of the good time we’ve shared and the support(支持) their friendship still gives me today. Our lives have gone in different directions, (B) _______ our friendship we created has kept us close. Every week I get a message on my answering machine from one of them, or a letter in the mail with the latest news or vacation photos. I often get an email with a joke for the day or words of comfort about some problems in my life. My friends often show up for surprise birthday parties, and one of them (C) _______ travelled two hours from the other end of town just to watch my first English speech contest. Our friendship has carried me through a lot of difficult experiences, and has enriched the good ones.

A．把盛有溶液的分液漏斗放在铁架台的铁圈中；

B．把50mL碘水和15mL CCl₄ 加入分液漏斗中，并盖好玻璃塞；

C．倒转漏斗用力振荡，并不时旋开活塞放气，最后关闭活塞，把分液漏斗放正；

D．检验分液漏斗活塞和上口的玻璃塞是否漏液；

E．静置，分层；

F．从分液漏斗上口倒出上层水溶液；

G．将漏斗上口的玻璃塞打开或使塞上的凹槽（或小孔）对准漏斗口上的小孔；

H．旋开活塞，用烧杯接收溶液．

就此实验，完成下列填空：

让我们一起来重温科学家的研究思路，像科学家一样地思考，回答科学家当年的科学问题．

科学家发现，狗切除胰腺后，尿液中出现了葡萄糖，并出现糖尿病病人的一些症状． 科学家将正常狗的胰管结扎，发现胰腺大都萎缩了，只有内部一团团的细胞﹣﹣胰岛活着，并且尿液中没有出现葡萄糖．科学家推测，胰岛分泌一种能够调节糖的吸收和利用的物质． 后来，加拿大科学家班廷从狗的胰岛中提取出了胰岛素，用胰岛素治疗患糖尿病的狗并获 得成功，从而开创了治疗人类糖尿病的新纪元：班廷因此获得了诺贝尔生理学和医学奖．