31. The conventional wisdom to deal with the problem of landslides is to build a _____ wall.
(A) wooden
(B) sandy
(C) concrete
(D) plastic
(E) steel
答案:登入後查看
統計: A(5), B(7), C(93), D(2), E(2) #1985517
統計: A(5), B(7), C(93), D(2), E(2) #1985517