题目

—Do you believe that American flags are made             China?   —Yes, I do. And you can see they are made            silk. A. in; from                  B. from; in               C. of; in   D. in; of 答案：D　　形成青藏高原独特高原气候的主要原因是： [　　] 　　A．纬度高 　　B．海拔高 　　C．距海远 　　D．副热带高气压带影响