下列辨别某瓶装油是否为“地沟油”的简易方法，一定涉及化学反应的是（ ）

神经系统结构和功能的基本单位是（ ）

   The Spring   1  is the Chinese New Year .It usually comes in February . everyone in Chinese likes it very much .When it comes ,Li Lei helps his parents clean the house and do some other housework . on that day , everyone  2  dumplings and some other delicious food . Li Lei likes New Years cakes vevy much. But Lingling says jiaozi is nicer than New year’s cakes. Chinese people eat jiaozi and cakes in the house .How happy they are!
1 处的单词是：____ 
2处的单词是：____ 
画线部分翻译成为汉语：____ 
When does the Chinese New Year come ?____ 
What does Li Lei do when New Year comes ?____ 

在有机物：①CH₃CH₃、②CH₂=CH₂、③CH₃CH₂C≡CH、④CH₃C≡CCH₃、⑤C₂H₆、⑥CH₃CH=CH₂中，一定互为同系物的是　 ____　，一定互为同分异构体的是　 ____．（填编号）