公共英語四級考前培訓(xùn)
發(fā)布時(shí)間:2019年08月16日
學(xué)習(xí)資料
【公共英語四級考前培訓(xùn)】
Scientists today are making greater effort to study ocean currents(洋流).Most do it using satellites and other high-tech equipment.However,ocean expert Curtis Ebbesmeyer does it in a special way--by studying movements of random floating garbage.A scientist with many years’experience,he started this type of research in the early 1990s when he heard about hundreds of athletic shoes washing up on the shores of the northwest coast of the United States.There were so many shoes that people were setting up swap meets to try and match left and right shoes to sell or wear.