高一英语完形填空一篇答案已给,每题求原因.请解释清楚,本人初三学生.

题目

高一英语完形填空一篇答案已给,每题求原因.请解释清楚,本人初三学生.
The central problem of economics is to satisfy the people's and nation's wants.
The problem we are faced with is that our resources, here identified as money, are __1__. The only way we can resolve our problem is to make choices. After looking at our resources, we must examine our list of __2__ and identify the things we need immediately, those we can postpone, and __3__ we cannot afford. As individuals, we face the central problem involved in economics-deciding just how to allocate our limited our limited resources to provide __4__ with the greatest satisfaction of our wants.
Nations face the same problem. As a country's population ___5__, the need for more goods and services grows correspondingly. Resources necessary to production may increase, but there __6__ are enough resources to satisfy the total desires of a nation. Whether the budget meeting is taking place in the family living room, in the conference room of the corporation __7__ of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find __8__ of allocating limited resources in order to satisfy unlimited wants.
A short time ago economists divided goods into two categories, free and economic. The former, like air and water, were in __9__ abundance that economists had no concern for them. After all, economics is the __10__ of scarcity and what to do about it. Today many of these "free goods" are __11__ very expensive to use. Pollution has made clean air and water expensive for producers' extra costs, and __12__ taxpayers who pay for the government's involvement in cleaning the environment.
In the 1990s, almost all goods are __13__. Only by effort and money __14__ obtained in the form people wish.
Meeting needs of people and the demands from resource available __15__ the basic activity of production. In trying to meet unlimited wants from limited economic goods, production leads to new problems in economics.
EXERCISE:
1. A) limited B) unlimited C) scarcity D) abundant
2. A) want B) problem C) wants D) resources
3. A) those B) some C) others D) many
4. A) them B) themselves C) ourselves D) ours
5. A) expand B) extends C) grows D) increase
6. A) always B) sometimes C) often D) never
7. A) management B) function C) board D) group
8. A) people B) economists C ) way D) methods
9. A) so B) great C) such D) such an
10. A) form B) study C) means D) source
11. A) practically B) in practice C)in reality D) practicably
12. A) the B) / C) for D) with
13. A) plentiful B) scarce C) abundant D) in full supply
14. A) they can be B) can they be C) they must be D) must they be
15. A) are led to B) leads C) lead to D) leads to
KEY:
A C A C C D C D C B C C B B D
第11题,还是不太明白practically或practicably为什么不能用,不是副词修饰形容词么?
第12题,这整句话不太明白,能不能翻译一下句子.
第14题,是不是所有only引导的句子都要倒装?能不能具体解释一下,谢谢.

答案

说的是资源（钱）,资源总是有限的.所以用limited.

同前面的相呼应 the people's and nation's （wants.）

排比,前一个用的Those,所以这里也是Those

整句的意思是提供给我们自己来满足我们的需求,所以要用ourselves

第一个扩张和第二个扩展都不适合,后两个似乎都可以用.但人口增长用Grow更好.

用never是对的,如前所述,资源永远是不足的.

board of Direcors 是固定用法,公司的董事会

找到分配的方法,这种方法绝不只是一个,所以用methods. 如果选项是ways而不是way,也可以.

abundance 是名词,不可数,用形容词修饰,所以用such. such that 是如此的…以至于

感觉,找不出原因.

都有实际上的意思,但只有in reality是现实中的实际情况,而不是从经验得来的.