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A．Y
B．N
C．NG
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更多“The warm lagoons along the coast of Baja, California are more appropriate for breeding tha”相关的问题
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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".
The Migration of the California Grey Whale
One of nature's greatest achievements is the California grey whale. At birth a grey whale calf(小仔) weighs 2,000 pounds and is fourteen feet long. Every day the calf consumes fifty gallons of the mother's milk and gains fifty pounds of weight. At maturity this whale will weigh 80,000 pounds, be fifty feet long and eat several tons of food each day. The California grey whale spends most of its sixty-year life span on the road.
Every year thousands of grey whales make the longest migration of any animal, traveling 7,000 miles each way between the Arctic(北极圈)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(鲸脂)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.
During these summer months in the Arctic the grey whales fatten themselves by consuming enormous quantities of small shrimp-like animals called amphipods (端足目动物). Recent observations of a young grey whale, Gigi II, held in captivity (囚禁) 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 escapee. These animals and the surrounding water are sucked into the whale's mouth. As the water is expelled from the mouth, it passes through coarse baleen (鲸须) fibres. The small animals are trapped and swallowed.
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 traveling in groups stay dose to the shore of North America, swimming both day and night and averaging about 100 miles per day.
Occasionally the whale will take a look around above the water or "skyhop". Either by beating its tail flukes (尾鳍) rapidly or by resting its tail on the bottom, the whale pushes its upper eight to ten feet of body out of the water and takes a look around. At other times the whale will leap its fifty-foot body almost clear of the water, creating a huge splash as it reenters the water. This "breaching" (跃出水面) may be to dislodge(驱逐)whale lice(虱子) or barnacles (附着甲壳动物) or possibly part of a courtship display.
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 weighs forty tons.
During December and January the grey whales arrive at the warm lagoons(环礁湖)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 (孕育) 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 (助产士). At birth the calf sinks toward the sea floor. Being a mammal (哺乳动物) 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's nipples (乳头) and rich whale milk is forced into its mouth. During the next two mont
A．Y
B．N
C．NG
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