某校同学准备利用暑假实地考察我国境内已知的最早人类遗址，他们应该去[ ]
A．北京房山
B．陕西蓝田
C．云南元谋
D．浙江余姚
答案：C
John opened the door. There he had never seen before.
A．a girl did stand
B．a girl stood
C．did a girl stand
D．stood a girl
简述森林生物地球化学循环的效能？
