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The grey whale lives on small shrimp-like animals called amphipods.A．YB．NC．NG
The grey whale lives on small shrimp-like animals called amphipods.
A．Y
B．N
C．NG
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（请给出正确答案）
The grey whale lives on small shrimp-like animals called amphipods.
A．Y
B．N
C．NG
答案
更多“The grey whale lives on small shrimp-like animals called amphipods.A．YB．NC．NG”相关的问题
第2题
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
第3题
听力原文： Millions of years ago, whales lived on land and walked on four legs. Today, whales still have small bones that are the remains of their hind legs, but these bones can only be seen on the inside of the whale. No one knows why whales left the land to live in the water.
However, scientists can imagine that when the whales changed their environment, their bodies underwent a change—taking on a more fish-like appearance. This new form. offered less resistance to the water, enabling the whales to swim faster.
Despite their fish like form, whales are not fish. A whale will drown, just as a man will, if it stays under water too long. When a whale is under water, it closes its nostrils tightly and holds its breath. The air in its lungs becomes very hot and full of water vapor. When the whale rises to the surface and exhales, its hot breath produces a column of water vapor that rises high in the air. A man produces the same effect when he exhales warm air on a cold morning.
Whales are classified as mammals because they bear their young, rather than laying eggs, and because the mother whales give the babies milk. Like other mammals, whales have warm blood. Their blood stays at the same temperature, even when they move from hot to cold water. They keep warm in cold water because they have a thick layer of fat just under their skins. This fat is called blubber, and it is thicker on whales that spend their lives in cold water. Almost all land mammals, except man, have hair on their bodies to keep them warm, but whales, which have very few hairs, are kept warm by their fat.
How does a whale keep itself warm？
A．By its thick layer of fat under its skin.
B．By moving frequently in the water.
C．By adjusting its blood temperature.
D．By taking in hot air.
第4题
听力原文： American scientists have found that some birds are more intelligent than experts had originally believed. The scientists say birds have abilities that involve communication and different kinds of memory. In some unusual cases, their abilities seem better than those of humans.
Griffin is a Grey parrot. He lives in his laboratory at the Massachusetts Institute of Technology in Cambridge. Griffin can arrange objects in order of size. He can also combine words in the right order. For example, he will combine words when asking for a piece of food.
Some birds have other memory skills. For example, they collect and store thousands of seeds in autumn, and find them later in winter. These birds use natural objects to find the seeds they have stored. They use at least three objects, such as rocks or trees, to find the stored seeds.
A jay can be trained to choose one object instead of another. The bird uses this skill to receive a prize, such as food.Scientists also say some birds can learn as many as two thousand different songs. They say songs may have developed as a way for birds to communicate with other birds.
Scientists believe that birds must have a special guidance system in their brain. Understanding how a bird's brain operates may help us better understand how a human brain processes information.
(26)
A．Talking.
B．Communication and memory.
C．Singing.
D．Finding the way.
第5题
The whale probably "skyhops" in order to increase the circulation of its blood.
A．Y
B．N
C．NG
第6题
A layer of blubber approximately six inches thick protects the whale in Arctic waters.
A．Y
B．N
C．NG
第7题
Looking through the telescope(望远镜),the captain _________a whale slowly emerging from the water.
A、revealed
B、searched
C、scanned
D、spotted
第9题
What do we learn about the blood temperature of a whale？
A．Grows colder as the blubber accumulates.
B．Remains the same.
C．Varies according to the water temperature.
D．Grows warmer as the whale grows older.
第10题
