可选用的地下水控制方法有（）。
A.集水明排
B.降水
C.截水
D.回灌
E.注浆
参考答案：A, B, C, D
加氢催化剂必须经过还原，才具有良好的活性。
– James didn’t ____ last night, did he?
– No. He ____. We had changed our plan.
A．turn away; shouldn’t have come
B．turn up; needn’t have come
C．turn up; didn’t need to come
D．turn away; doesn’t need to come
