阿摩線上測驗
9. These prairies are traversed by ridges, which facilitates irrigation, and are under-laid by an _____
subsoil, which facilitates both effective storage and drainage.
(A) impervious
(B) impetuous
(C) impudent
(D) incongruous
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統計： A(34), B(13), C(2), D(5), E(0) #1890171
統計： A(34), B(13), C(2), D(5), E(0) #1890171
