【正确答案】
D
【答案解析】[听力原文] There will be more plastic than fish in the world's oceans by 2050 unless more recycling takes place. That is what a new report from the World Economic Forum and Ellen MacArthur Foundation warns. The problem is that each year at least 8 million tons of plastics end up in the oceans around the world. Not all plastic ends up in the ocean because someone throws a plastic bottle into the water. Plastic containers and other trash thrown onto streets and sidewalks often are swept into oceans. The debris travels from storm drains during rain storms, said the environmental group Marine Defenders. Unlike other types of trash in the ocean, the plastic never bio-degrades. That means it does not break down. For decades, scientists warned that plastics are killing fish. The Natural Resources Defense Council said research shows that fish are dying from choking after eating plastics. Another cause of death is that plastics cause 'intestinal blockage and starvation,' the environmental group said. What is this news mainly about? 新闻开头的主题句明确指出，如果不更多地进行回收利用，到2050年时海洋中的塑料数量将超过鱼类数量。由此可知，这则新闻主要叙述海洋中的塑料污染问题，新闻后面的内容进一步解释了塑料污染物的来源和危害等，因此正确选项是D。