49. Why is Costa Rica mentioned in the passage?
(A) To prove that the pollution is not as serious as once thought.
(B) To show that tourism is a very profitable industry.
(C) To illustrate the powerful influence of the global media.
(D) To show that people are paying attention to conserve nature.

答案:登入後查看
統計: A(1), B(4), C(5), D(10), E(0) #488714