問題詳情

18._____ are not leached out of soil,reclamation procedures are need to restore the land’s productivity.
(A)For concentrations of salt
(B) Salt concentrahons that
(C) If salt concentrations
(D)with concentrations of salt

參考答案

答案:C
難度:困難0.333333
統計:A(4),B(0),C(4),D(1),E(0)

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