The ocean is heating up. That's the conclusion of a new study that finds that the Earth's oceans now ___1____heat at twice the rate they did 18 years ago. Around half of ocean heat intake since 1865 has taken place since1997, researchers report online in Nature Climate Change. Warming waters are known to ___2___to coral bleaching(珊瑚白化)and they take up more space than cooler waters, raising sea__3____. While the top of the ocean is well studied, its depths are difficult to _____4___. The researchers gathered 150 years of ocean temperature data in order to get a better ____5_____of heat absorption from suce to seabed. They gathered together temperature readings collected by everything from a 19th century ____6____of British naval ships to modern automated ocean probes. The extensive data sources, ____7____with computer simulations(计算机模拟), created a timeline of ocean temperature changes, including cooling from volcanic outbreaks and warming from fossil fuel ____8____. About 35 percent of the heat taken in by the oceans during the industrial era now resides at a _____9____ of more than 700 meters, the researchers found. They say they're ___10____ whether the deep-sea warming canceled out warming at the sea's suce. A.aborb B.combined C. contribute D.depth E. emissons F. excursion G. explore H. floor I. heights J. indifferent K. levels L. mixed M. picture N. unsure O. voyage