5. C; transportation, (chemicals), tourism 并列, 单复数最好一致. chemical(n.)化学制品;
4, 非限定性定语从句: 用来修饰, 比如: 美丽blahblah; 限定性定语从句: 确定描述对象, 比如: 前排第三个.....
3, Acclimatization is the process by which an organism adjusts to living in an environment to which it normally unsuited.
a> Acclimatization is the process
b>an organism adjusts by the process to living in an environment
c> it normally unsuited to an environment
2. select/point ... as ...(position);
1, 看不懂

1. Each (of functions) (of the body), even thinking, require the (expenditure) (of energy).
A each of functions -->each function

2. ＂Select you as chairman＂, or ＂select you chairman＂. 谁对？
second one

3. 介词 + which 的法则是什么？
如: Acclimatization is the process by which an organism adjusts to living in an environment to which it normally unsuited.
不明白为什么是by + which, 根据语感知道它是对的, 正如接下来的to which 一样. 知其然不知其所以然.
first one: by process
second one: unsuited to environment

4. 什么叫非限定性定语从句? 虽然不懂也不妨碍做题, 但还是想知道一下.
collapsar is a girl who asked a question. 限定性定语从句
collapsar is a girl, who asked a question. 非限定性定语从句

5. 改错:
The major (economic) activites of Cheyenne, Wyoming, (include) transportation, (chemicals), tourism, (but) goverment activities.

but-->and