試題詳解

48. What has his organization done over the years?
(A)It helped clean Cedar River after a serious flood in 2008.
(B) It has picked up 1,000 kilos of junk from America’s largest rivers.
(C)It has gathered support from about just a few companies and foundations.
(D) It has removed from the rivers all kinds of things excluding tires, refrigerators, toilets, etc.