IF EITHER OF YOU TAKE A VACATION NOW, WE WON’T BE ABLE TO FINISH THIS...

65: If either of you take a vacation now, we won’t be able to finish this work. A B C DRead the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to eachof the questions from 66 to 75. Quite different from storm surges are the giant sea waves called tsunamis, which derive their name from theJapanese expression for "high water in a harbor". These waves are also referred to by the general public as tidal waves,although they have relatively little to do with tides. Scientists often refer to them as seismic sea waves, far moreappropriate in that they do result from undersea seismic activity. Tsunamis are caused when the sea bottom suddenly moves, during an underwater earthquake or volcano, forexample, and the water above the moving earth is suddenly displaced. This sudden shift of water sets off a series of waves.These waves can travel great distances at speeds close to 700 kilometers per hour. In the open ocean, tsunamis have littlenoticeable amplitude, often no more than one or two meters. It is when they hit the shallow water the coast that theyincrease in height, possibly up to 40 meters. Tsunamis often occur in the Pacific because the Pacific is an area of heavy seismic activity. Two areas of the Pacific wellaccustomed to the threat of tsunamis arc Japan and Hawaii. Because the seismic activity that causes tsunamis in Japan oftenoccurs on the ocean bottom quite close to the islands, the tsunamis that hit Japan often comes with little warning and cantherefore prove disastrous. Most of the tsunamis that hit the Hawaiian Islands, however, originate thousands of miles away nearthe coast of Alaska, so these tsunamis have a much greater distance to travel and the inhabitants of Hawaii generally have timefor warning of their imminent arrival. Tsunamis are certainly not limited to Japan and Hawaii. In 1755, Europe experienced a calamitous tsunami, whenmovement along the fault lines near the Azores caused a massive tsunami to sweep onto the Portuguese coast and flood theheavily populated area around Lisbon. The greatest tsunami on record occurred on the other side of the world in 1883when the Krakatoa volcano underwent a massive explosion, sending waves more than 30 meters high onto nearbyIndonesian islands; the tsunami from this volcano actually traveled around the world and was witnessed as far away as theEnglish Channel.