45.aWhat is the main topic of this passage?
(A) Alternating current versus direct current
(B) Local utility service
(C) What you should know about working with electricity at home
(D) How power reaches your home
答案:登入後查看
統計: A(1), B(2), C(3), D(4), E(0) #802373
統計: A(1), B(2), C(3), D(4), E(0) #802373