B听对话，根据所提问题选择正确的应答语。（每段对话读两遍）
（ ）6. Which country has the second largest population?
A. India B. China C. America
（ ）7. How long has Jack collected stamps?
A. 3 years B. 4 years C. 5 years
（ ）8. What do people use to produce electricity in Li Ming’s hometown?
A. coal B. wind C. water
