矿区废弃地生态恢复工程的关键是植被恢复和土壤微生物群落的重建。
参考答案：对
It was not until then that I came to know that knowledge _______ only from practice.
A．had come
B．has come
C．came
D．comes
具有滋肾补阴功能（）
A．山楂调中丸
B．开胃山楂丸
C．葛根芩连微丸
D．养胃舒胶囊
E．龙荟丸
