Unit 19 B卷
一、阅读理解
A
The climate secrets of the deepest part of the ocean,the Marianas Trench(壕沟)in the western Pacific Ocean,have been explored by scientists.
The international team used a submersible,designed to withstand great pressure,to study the bottom of the 10.9kmdeep underwater canyon.Their early results reveal that ocean trenches are acting as carbon sinks.This suggests that they play a larger role in regulating the Earth’s chemistry and climate than was thought.
Although two explorers,Jacques Piccard and Don Walsh,reached the deepest part of the Marianas Trench—a point called the Challenger Deep—in 1960,no humans have been back since.And the scientific missions,including this recent visit to this deepest spot,have been carried out using unmanned underwater vehicles.
Lead researcher Professor Ronnie Glud,from the University of Southern Denmark and the Scottish Association for Marine Science,said that working at more than 1,000 atmospheres of pressure was challenging,but advances in technology had made it possible.
He told BBC News,“This is the first time we have been able to set down sophisticated(精密的)instruments at these depths to measure how much carbon is buried there.”The tests also helped the scientists to assess the storage of carbon at those dark depths.
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