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All whales fall into two groups, those with teeth and those without. Both beluga and dolph

in belong to the suborder of toothed whales known as Odontoceti, along with porpoises, narwhals, pilot whales, killer whales and the largest toothed creature in the world, the sperm whale. Size differences among the Odontoceti are remarkable. A common porpoise will run only 4 or 5 feet in length and 300 pounds in weight; a sperm whale may be 10 times as long and 300 times as heavy. The beluga falls in between, weighing up to 2,000 pounds. And it does chirp. In fact, it makes a great variety of squeaking, whistling, and clicking sounds, which have earned it the name of sea canary.

The toothless, or baleen, whales belong to the suborder of Mysticeti. This is a group of generally large whales, formerly abundant in all the oceans of the world. Though reduced by hunting, most species are still found along the coasts of the United Stated and Canada. All but two of the Mysticeti reach 40 feet or more at maturity, with the blue whale running up to 100 feet and tipping the scales at up to 130 tons. This whale is by far the largest creature that has ever lived on earth, 4 times the weight of the largest dinosaur, 30 times that of an elephant.

With what topic is the passage mainly concerned？

A．Breeding habits of whales.

B．Differences between whales.

C．Efforts to preserve whales.

D．The intelligence of whales.

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更多“All whales fall into two group…”相关的问题

第1题

All of the following whales belong to the suborder of Odontoceti EXCEPT ______.A．narwhalsB

All of the following whales belong to the suborder of Odontoceti EXCEPT ______.

A．narwhals

B．dolphins

C．blue whales

D．pilot whales

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第2题

All the world is（)three parts – finger－feeders, chopstick－feeders, and fork－feeders.

A.fall into

B.separate from

C.broken up

D.divided into

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第3题

Which of the following fall（s) under the responsibilities of a project manager？A.Labor rel

Which of the following fall(s) under the responsibilities of a project manager？

A . Labor relations with project personnel

B . Affirmative action

C . Personnel training

D . Discrimination and equal employment opportunity

E . All of the above

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第4题

There are many reasons of the tidal action which is a very complicated phenomenon involvin

g many factors all of which must be considered to predict tide in any one place at any one time. The alternate rise and fall of the surface of the seas and the ocean is mainly caused by the attractive force of the moon alone. When the attraction is great, the tide is high; and conversely when the attraction is minimal, the tide is low. Between the high and the low tide is a period of a little over six hours, being called during its rise a flood tide, and during its fall an ebb tide.

The sun also exerts its effect on the tide, being a lit fie less than half as much as the moon, although its mass is so much greater. When the moon and the sun are horizontal, the highest high tide occurs and when they are vertical the lowest low tide takes place.

The wind also plays an important part in the modification of the normal rise and fall of the tide. Thus these factors affect each other, either detracting or adding to the attractive forces to add or subtract from the weight of the tide. But the tides still move inexorably on, rising twice a day, getting a little later each day and posing a problem of correctly predicting their heights and lows.

Which of the following factors will not affect the time of the tide？

A．The position of the sun and the moon.

B．The mass of the moon.

C．The wind.

D．All of the above mentioned factors.

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第5题

Human‘sbrainsarelargerinproportiontotheirbodiesthan_______.A.whalesB.awhaleC.thatofwhalesD

Human‘s brains are larger in proportion to their bodies than _______. A. whales B. a whale C. that of whales D. those of whales

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第6题

If you are like most people, your intelligence varies from season to season. You are proba

bly a lot sharper in the spring than you are at any other time of year. A noted scientist, Ells- worth Huntington (1876-1947) concluded from other men's work and his own among peoples in different climates that climate and: temperature have a definite effect on our mental abilities.

He found that cool weather is much more favorable for creative thinking than summer heat is. This does not mean that all people are less intelligent in the summer than they are during the rest of the year. It does mean, however, that mental, abilities of large numbers of people tend to be lowest in the summer.

Spring appears to be the best period of the year for thinking. One reason may be that in the spring man's mental abilities are affected by the same factors that bring about great changes in all nature.

Fall is the next best season, then winter. As for summer, it seems to be a good time to take a long vacation from thinking!

According to the passage, your mental ability ______.

A．depends on your attitude towards people in different time of the year

B．changes for the worst when you dislike most people in hot season

C．will be best in winter and worst in summer if you want to be creative

D．turns to be more powerful in spring than in any of the other seasons

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第7题

Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a

day in the not-mo-distant future when all autos will be abandoned and allowed to rust. Other authorities, however, think the auto is here to stay. They hold that the car will remain a leading means of travel in the foreseeable future.

The motorcar will undoubtedly change significantly over the next 30 years. It should become smaller, safer, and more economical, and should not be powered by the gasoline engine. The car of the future should be far more pollution-free than present types.

Regardless of its power source, the auto in the future will still be the main problem in urban traffic congestion(拥挤). One proposed solution to this problem is the automated highway system.

When the auto enters the highway system, a retractable(可伸缩的) arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically. Once attached to the rail, the car will become electrically powered from the system, and control of the vehicle will pass to a central computer. The computer will then monitor all of the car's movements.

The driver will use a telephone to dial instructions about his destination into the system. The computer will calculate the best route, and reserve space for the car all the way to the correct exit from the highway. The driver will then be free to relax and wak for the buzzer(蜂鸣器) that will warn of his coming exit. It is estimated that an automated highway will be able to handle 10,000 vehicles per hour, compared with the 1,400 to 2,000 vehicles that can be carried by a present-day highway.

One significant improvement in the future car may probably be ______.

A．its power source

B．its driving system

C．its monitoring system

D．its seating capacity

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第8题

Why might the increasing number of whales cause problems with their health？ A．There's not

enough room for them in Alaska. B．There may not be enough food for them in Alaska． C．They get pushed ashore. D．There are more whales to spread disease.

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第9题

About how many more whales have been sighted in the San Francisco Bay this year compared t

o last year？ A．Twice as many. B．Three times as many． C．Half as many. D．About the same.

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第10题

There are more than 100 million cars in the United States. A normal car gets less than 15

miles from each gallon of gas. It travels about 10,000 miles each year. In that time, it uses about 650 gallons of gas. In all, autos use up some 70 billion gallons of gas a year. That comes out to be four-and-a-half million barrels a day.

The importance of saving gas, then, cannot be stressed too much. Let's say, for instance, that the fuel used by each car could be cut back just 15 percent. This could be done by making fewer trips each day. It could be done through better driving habits. If it were done, our nation's use of fuel would fall by close to two-thirds of a million barrels per day.

We can all help save gas. One way is to ride the buses. Some of us could walk to work. We could ride mopeds(机动脚踏两用车) or bikes. Another way is to share a ride. We could join carpools (合伙使用汽车). About one-third of all cars are used for going to and from work.

Go shopping with a friend from time to time. If two people use a car instead of one, we all save. There would be fewer cars on the road. The savings on gas around the nation would come to more than one half million barrels a day.

Another way to save is by cutting our useless trips. Can you find one car trip per week that could be handled by telephone？ Can you combine trips？ If each car took one less 10-mile trip a week, we could save three-and-half billion gallons of gas a year. This comes to nearly 5 percent of the total passenger car demand for gas.

The way people drive decides how much fuel they save. Careful drivers may get20 percent more miles per gallon than normal drivers. They could get 50 percent more miles per gallon than wasteful drivers. Careful drivers obey the 55-mile-per-hour speed limit. They get to their desired speed quickly and keep a steady pace.

If just one gallon of gas were saved each week for each car in the country, we could all save about five-and-half billion gallons a year.

To decrease the number of useless car trips, you can use the ______.

A．bus service

B．subway service

C．telephone

D．airplane

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