世界毒源地“金三角”地区位于哪三个国家的交界处？
参考答案：
位于老挝、泰国、缅甸三个国家的接壤地区。
A lot of new technology _____ into schools to make learning more effective these years. [ ]
A. introduced
B. has introduced
C. was introduced
D. is being introduced
机构应当于每年（）月份向中国证监会报送年度执业报告
A.4
B.6
C.5
D.7
