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1、Unit 7The SeaPeriod OneWarmup & Lesson 1 The Spirit of Explorers.阅读理解AUnder the worlds oceans and seas lies an attracting world of lands that stretches hundreds of kilometers in every direction.In this world，without the sun，there are deep canyons (峡谷)，great plains，and towering ranges of mountains.An
2、d this underwater world covers 70 percent of the earths surface.The worlds longest mountain range extends 16,000 kilometers under the Atlantic Ocean from Iceland to the Antarctic.Called the MidAtlantic Ridge (山脊)，this range of mountains contains a number of high peaks，among them are the Ascension Is
3、land，the Azores，and Iceland.The worlds highest mountain is found in the midPacific area.It is the Hawaiian volcano Mauna Kea，which is 9,450 meters from base to peak.This is nearly 610 meters taller than Mount Everest.Only 4,221 meters of Mauna Kea rises above the surface of the sea.In 1873 the Briti
4、sh survey ship Challenger discovered the deepest trench (海沟) in all the seas.Named the Challenger Deep，it is near the island of Guam and is 11 kilometers deep.Since sunlight only reaches to a depth of about 244 meters，many of the creatures of the deep sea live in a world of darkness.However，to get h
5、elp in their survival，many have their own bright lighting system.Food comes to them from the upper levels of the ocean and they can get a constant supply from the waste matter that gradually moves downward toward the ocean floor.These undersea creatures must remain at the various places for which th
6、ey are fit.To wander to other levels could result in death from improper water pressure.1The best title for this text should be .AThe Sunless WorldBThe Longest MountainCThe Highest MountainDThe Deepest Trench答案A解析主旨大意题。通读全文可以看出，这篇文章主要讲述的是黑暗的海底世界的一些情况。2The worlds longest mountain range under the ocea
7、n .Aextends 1,600 kilometers under the Atlantic OceanBis called the MidAtlantic RidgeCcontains few high peaksDextends from Iceland to the Azores答案B解析细节理解题。由第二段可得出本题的答案。3From this passage we know that .Athe longest and the highest mountains lie in the seaBthe highest mountain lies on landCthe longest
8、 mountain lies on landDMauna Kea is 4,221 meters high答案A解析细节理解题。由第二、三段我们知道，最长的山脉在大西洋，最高的山峰则在太平洋中部的夏威夷。据此，我们可得出本题的答案。4If a kind of creature lives in an sea area about 300 meters from the surface， .Athe creature wont have enough food to eatBthe creature will feel very coldCthe creature will have to gi
9、ve light by itselfDthe creature will feel too hot答案C解析推理判断题。从最后一段我们知道，阳光只能到达离海面244米的地方，在此以下的地方生活的动物就必须靠自己的发光系统照明。BAs a seal rests on ice floating on the Antarctic Ocean，it should feel safe.But it is about to become a victim of a group of killer whales who have developed a great skill to catch seals.
10、The killer whales work together as a group to create large waves that wash seals off the ice.Scientists who have discovered the technique，which has only been seen in killer whales hunting in the pack ice of the Antarctic，say it is so effective that it produces a meal for the whales three out of ever
11、y four times they use it.Dr.Robert Pitman，a marine scientist at the National Oceanic and Atmospheric Administration in California，said，“The killer whales were very good at knowing in advance if they were going to be able to wash a seal off a piece of ice and they were always successful in getting th
12、e seal into the water.Sometimes the seal was washed off but managed to flee.However，it was not very often.”Dr.Pitman and his colleague Dr.John Durban helped BBC capture the wavewashing behaviour on camera.By swimming in formation(队列) towards the ice from as far away as 150 feet，the whales created a
13、bow wave in front of their bodies.When they reached the block of ice where the seal was hiding，they dove under the ice，kicking their tails in a powerful stroke(击) to create a large wave that washed over the ice and knocked the seal into the water where they could grab it and drown it.Research has sh
14、own that there are at least four types of killer whales living in the Antarctic，all of which have different colour patterns and hunting behaviour，and eat different things.The largest killer whale hunts minke whales in open water while the ice killer whales mainly hunt seals.A third type of killer wh
15、ale mainly preys on penguins and the fourth dives deep to hunt fish.5According to Paragraph 1，killer whales hunt a seal on a piece of ice by .Apushing the ice onto the groundBknocking hard on the ice togetherCcreating large waves to wash it off the iceDfollowing it all the time until it swims in the sea答案C解析细节理解题。根据第一段最后一句“The killer whales work together as a group to create large waves that wash seals off the ice.”可知这种鲸鱼通过制造大浪把海豹从冰上冲刷下来，然后捕食它们。6It is implied in the passage that .Akiller whales often stay hungryBkiller whales usually hunt aloneCcompetition among killer whales is very fierce
