无铅汽油一般是加入甲基叔丁基醚【CH₃OC(CH₃)₃】作为高辛烷值组分。下列关于甲基叔丁基醚叙述错误的是（）                        

、阅读材料
材料一：西欧罗马教皇是上帝在人间的最高代表，“权力好比太阳。”基督教神学是一切知识的顶峰，凡与宗教神学对立的主张和言论均视为“异端”。
——川教版《世界历史》
材料二：文艺复兴时期，但丁在一部文学作品中写到：自己幻游地狱、炼狱和天堂……在地狱里，他看到了已故教皇和当时还活着的教皇正在受刑，但丁高兴地说：“真是罪有应得!”                          ——《世界文化史》
请回答：
（1）材料一反映的是中古时代西欧的哪一历史现象?  这一历史现象对西欧社会的发展产生了什么影响?                                              
（2）材料二介绍的是但丁哪一部文学作品? 根据材料指出，这部作品的观点与材料一有何冲突? 从中可以看出文艺复兴的实质是什么?                    
（3） 结合所学知识，说说文艺复兴对人们的思想产生了什么影响?         

    When you stay away form your home for a long time, you start to miss your good bed, your good parents. Believe it or not, you're feeling homesick. You can help yourself to feel less homesick. Here's how:

      ⑴   .If you're going away from home, bring your favourite clothes, you can also bring some pictures of the people who you may miss. You can look at them any time you want.

       ⑵   .The busier you are, the less time you'll have to feel homesick. Spend your free time on music, sports or books. Try to join in activities whenever you are.

       ⑶   .You can make a plan for when you'll call your mom or dad. You can also keep in touch with family and friends by email or text messages.

       ⑷   .Sometimes, telling someone that you're feeling a little homesick will help you feel better. Maybe you can tell a friend that you feel homesick and the two of you can do something fun.

根据句意，在对应题号的横线上，写出括号内所给单词的适当形式。