What can we do to （保护；保存）the natural resources from ruin?
举一反三
- What are the major natural resources in the U.S.?
- From what we learn from the text, we can assume that the author is ______ .
- What can we do to solve these problems?
- Things from Earth that people use are ___________. A: animal resources B: human resources C: natural resources
- What are the major natural resources in the United States?