Which of the following is a reason that little progress has been made toward the ambitious goals set at the 1992 Earth Summit in Rio de Janeiro? 1992年在巴西里约热内卢举行的地球问题首脑会议制定了雄心勃勃的目标,但至今没有取得什么进展,原因是以下哪一个?
A.
China has shown a strong appetite to adopt tighter pollution controls.中国已表现出采取更严格污染控制措施的强烈意愿。
B.
Political cooperation in the U.S. Congress promotes domestic action.美国国会的政治合作促进国内行动。
C.
There is a culture of denial in the United States.在美国有一种否认的文化。
D.
Trade liberalization efforts have not been rolled back.贸易自由化的努力没有倒退。