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Every year thousands of grey whales make the longest migration of any animal, traveling

7,000 miles each way between the Arctic and Baja, California. The grey whales spend the long summer days in their Arctic feeding grounds in the Bering Sea between Alaska and Russia. Unlike a fish, the whale is warm-blooded and must therefore maintain a relatively high internal body temperature. In the cold Arctic waters the grey whale is protected by an outer layer of blubber which averages six inches in thickness. Other whales such as the Greenland Night whale have been found with a two-foot thick layer of blubber covering their bodies.

2. During these summer months, in the Arctic the grey whales fatten themselves by consuming enormous quantities of small shrimp-like animals called amphipods. Recent observations of a young grey whale, Gigi Ⅱ, held in captivity at Sea World in San Diego during 1971 and 1972, suggest that the grey whale feeds by sweeping its enormous head over the bottom. The amphipods on which it feeds are either stirred off the bottom or leap off the bottom to escape. These animals and the surrounding water are sucked into the whale&39;s mouth. As the water is expelled from the mouth, it passes through coarse baleen fibres. The small animals are trapped and swallowed.

3. In October as the days get shorter and ice begins to form. over the Arctic feeding grounds, the California grey whale begins its long journey south to the warm waters of Baja, California. During this three-month long trip the whales travelling in groups stay close to the shore of North America, swimming both day and night and averaging abut 100 miles per day.

4 During the trip south the grey whales that are sexually mature, at least three years old, and not pregnant already, form. mating groups. These groups are composed of three whales, two males and a female. The dominant male couples with the female while the second male is kept busy positioning the two whales on their sides facing each other and keeping them together during the sex act. This is no small job, since each whale can be fifty feet long and weigh forty tons.

5. During December and January the grey whales arrive at the warm lagoons along the coast of Baja, California. The whales swim miles inland along narrow shallow channels. These channels are the breeding grounds of the California grey whale. The calf has been gestating in the pregnant female for the last thirteen months, that is, since her last journey south. The expectant cow is aided in the birth of the calf by another female that acts as a midwife. At birth the calf sinks toward the sea floor. Being a mammal the whale must breathe at the surface. The midwife guides the baby whale to the surface for its first gulp of air. The calf then finds its mother&39;s nipples and rich whale milk is forced into its mouth. During the next two months the calf will grow twenty feet and double its weight.

6. In March the whales begin their long journey north to the Arctic. The newly-pregnant females leave first, following by the males and immature females. The last to leave the warm waters of Baja are the females and their calves. The whales arrive at their Arctic feeding ground in June. Many scientists believe that during this entire eight month long, 14,000 mile journey, the California grey whale does not feed at all!

Paragraph 3 ______

A. The Voyage Back B. An Arctic SummerC. Feeding Habits D. At the Breeding GroundsE. The Move SouthF. Mating

Paragraph 4 ______

A. The Voyage Back B. An Arctic SummerC. Feeding Habits D. At the Breeding GroundsE. The Move SouthF. Mating

Paragraph 5 ______

A. The Voyage Back B. An Arctic SummerC. Feeding Habits D. At the Breeding GroundsE. The Move SouthF. Mating

Paragraph 6 ______

A. The Voyage Back B. An Arctic SummerC. Feeding Habits D. At the Breeding GroundsE. The Move SouthF. Mating

A layer of blubber approximately six inches thick ______.

A. small shrimp-like animals called amphipods．B. protects the whale in Arctic waters.C. increase the circulation of its blood.D. two males and one female.E. leaves its Arctic feeding grounds,F. the surface of the water by a whale "midwife".

The whale feeds on______.

A. small shrimp-like animals called amphipods．B. protects the whale in Arctic waters.C. increase the circulation of its blood.D. two males and one female.E. leaves its Arctic feeding grounds,F. the surface of the water by a whale "midwife".

A mating group consists of ______.

A. small shrimp-like animals called amphipods．B. protects the whale in Arctic waters.C. increase the circulation of its blood.D. two males and one female.E. leaves its Arctic feeding grounds,F. the surface of the water by a whale "midwife".

The newly-born whale is assisted to _______.

A. small shrimp-like animals called amphipods．B. protects the whale in Arctic waters.C. increase the circulation of its blood.D. two males and one female.E. leaves its Arctic feeding grounds,F. the surface of the water by a whale "midwife".

请帮忙给出每个问题的正确答案和分析，谢谢！

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发布时间：2020-10-16
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第8题

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听力原文：M: Every year, as the seasons change, many birds, fish, insects and land animals
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This is migration. There are many things which help animals to migrate. Birds and other animals have a body clock which tells them about changes in temperature and periods of light. Birds and some insects use their eyes to measure and compare the position of the sun from different place.

Many people now believe magnetism is very important. The earth itself is a magnet and every kind of life is affected in some way by its magnetic, fields.

But there are still many questions without answers, for example, the migration of eels. European eels travel down their rivers and into the Atlantic Ocean. They then swim 5600 kilometers to the Sargasso Sea, where they lay their eggs. The eels then die. The baby eels are carried by the Gulf Stream to Europe, a journey which takes two and a half years. They swim back up the rivers. There they live for about ten years before the return journey to the Atlantic. How do they do this？ We know what happens to the eels but not how or why.

"Migration" in this passage means

A．the seasonal moving of creatures.

B．settling down in a new place.

C．the activity controlled by magnetism.

D．knowing where one is going and making no mistakes.

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第10题

听力原文：It seems like almost everyone buys or sells goods at yard sales in the United Sta

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The LT. S. one Twenty-Seven Corridor Sale is known as the World's Longest Yardsale. It began in 1987. The event's headquarters is in Jamestown, Tennessee. A former local official, Mike Walker, came up with the idea (31) . He thought it would bring people to the area and show them that small country roads have a lot to offer. Others agreed. They wanted people to consider traveling on these roads instead of the popular interstate system.

Every year, the four-day sale begins on the first Thursday in August. So August 7th of this year marks the opening of the twenty-first World's Longest Yardsale. The event now crosses five states--Ohio, Kentucky, Tennessee, Georgia, and Alabama.

Tens of thousands of sellers take part. Some people who live along or near Route one Twenty-seven simply place their goods for sale in front of their house. Others use nearby public spaces, like parks. People sell everything and anything at the sale: furniture, clothing, toys, books and music. You can also find sporting goods, farm equipment, tools and art. And, lots of other things (32) . Tens of thousands of people from across the country drive along the road in search of interesting things to buy. Route one Twenty-Seven becomes crowded with vehicles.

(31)

A．They are places for people to exchange their goods.

B．They are places for residents to heap the useless things.

C．They are sales set for residents to sell and buy used things.

D．They are sales set by stores to put their goods on sale.

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第11题

听力原文：Everywhere we look, we see Americans running. They run for every reason anybody c

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(30)

A．Three minutes.

B．Two Minutes.

C．One minutes.

D．Five minutes.

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