請依下文回答第46題至第50題：
There are around 380 underwater cables in operation around the world, spanning a length of over 1.2 million kilometers
(745,645 miles). In 2012, Hurricane Sandy slammed into the U.S. East Coast, knocking out several key exchanges where
undersea cables linked North America and Europe. The entire network between North America and Europe was isolated
for a number of hours. For us, the storm brought to light a potential challenge in the consolidation of transatlantic cables
that all landed in New York and New Jersey. But most often when a cable goes down, nature is not to blame. There are
about 200 such failures each year and the vast majority are caused by humans. “Two-thirds of cable failures are caused
by accidental human activities, fishing nets and trawling and also ships’ anchors,” said an expert. “The next largest
category is natural disaster, mother nature -- sometimes earthquakes but also underwater landslides.” A magnitude-7.0
earthquake off the southwest coast of Taiwan in 2006, along with aftershocks, cut eight submarine cables which caused
internet outages and disruption in Taiwan, Hong Kong, China, Japan, Korea and the Philippines.
【題組】47. According to the passage, which of the following events have caused most of the cable failures?
(A)Earthquakes. (B)Storms. (C)Sea waves. (D)Human activities.
由此可知： There are about 200 such failures each year and the vast majority are caused by humans. “Two-thirds of cable failures are caused by accidental human activities, fishing nets and trawling and also ships’ anchors,” said an expert.
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