What caused the mudslide according to the research hydrologist?

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问题 What caused the mudslide according to the research hydrologist?
  
Jim O’Connor, a research hydrologist told National Geographic that the mudslide, which was up to 4. 5 meters deep in some areas, was caused by ground made unstable by heavy rainfall.
Hurricanes, cyclones, and typhoons—collectively known as tropical cyclones—all require storm clouds, surface ocean temperatures above 27 degrees Celsius, and very little wind shear.

选项 A、Hurricanes need two factors to come into being.
B、Typhoons need just one condition to come into being.
C、Not every type of tropical cyclones needs three conditions to come into being.
D、All three types of tropical cyclones need three conditions to come into being.

答案D

解析 根据原文的意思,三种热带风暴(即tropical cyclones)都需要积雨云(storm clouds)、海洋表面温度高于27摄氏度(surface ocean temperatures above 27 degrees Celsius)和微小的风切变(very little wind shear)三个条件,故D是正确选项。
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