What is the latest discovered reason for the massive die-off of the shellfish mussels in the Clinch River?

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问题 What is the latest discovered reason for the massive die-off of the shellfish mussels in the Clinch River?
Scientists are investigating a massive die-off of the shellfish mussels in the Clinch River in southeastern United States. Scientists blame this on pollution, habitat loss and climate change. But they suspect the most recent decreases have another cause. Richard, a biologist, and his team believe an infectious disease could be responsible. The team is comparing healthy mussels with dying ones in an attempt to narrow down a list of possible diseases.

选项 A、Water pollution.
B、Habitat loss.
C、Climate change.
D、An infectious disease.

答案D

解析 根据新闻定位句可知,美国东南部克林奇河的贝类贻贝大规模死亡可能是一种传染性疾病引起的。故选D。
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