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.
The unprecedented event was attended by 170 worldwide media organizations.

选项 A、117.
B、70.
C、17.
D、170.

答案D

解析 该题是考查数字的听辨能力,尤其注意70和17的读音区别,正确数字是170,故D为正确选项。
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