桑寄生的功效是（）
A.补肝肾
B.强筋骨
C.祛风湿
D.安胎
E.活血舒筋
参考答案：A, B, C, D
We had tried everything to improve their living conditions, but it made little ______.
A．good
B．use
C．result
D．difference
计算并填写下表
