题目内容：
Economists study the way a society uses scarce resources such as land, labor and raw materials.
参考答案：
答案解析：
选择题：Economists study the way a society uses scarce resources such as land, labor ...
- 题目分类： 大学英语B级
- 题目类型：选择题
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Fred was such a hardworking student that he soon came out first in the class.
Fred was such a hardworking student that he soon came out first in the class.
Great writers are those who not only have great thoughts but also express the...
Great writers are those who not only have great thoughts but also express the...
I need you to fill out the top portion of the form first.
I need you to fill out the top portion of the form first.
困扰我国的生态问题有哪些？
困扰我国的生态问题有哪些？
I will finish reading this book in a week.
I will finish reading this book in a week.