1. Why does yunjin have a high collecting value?
2. What does the underlined word "complex" in Paragraph 2 mean?
3. The Chinese government set up Nanjing Yunjin Research Institute to ______.
4. What do you learn about yunjin from the passage?
5. Which can be the best title for the passage?
C
2. What does the underlined word "complex" in Paragraph 2 mean?
B
3. The Chinese government set up Nanjing Yunjin Research Institute to ______.
A
4. What do you learn about yunjin from the passage?
C
5. Which can be the best title for the passage?
D
答案：1.C 2.B 3.A 4.C 5.D