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[主观题]

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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发布时间：2021-10-15

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

______, the world’s transport and communication system would fall apart.

A.With all the electricity turning off

B.With all the electricity turned off

C.All the electricity has turned off

D.Has turned off all the electricity

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第4题

What is not mentioned in the passage？A．Rain does not fall from all the clouds.B．The effect

What is not mentioned in the passage？

A．Rain does not fall from all the clouds.

B．The effect of the gravity on droplets is minute.

C．The average raindrop contains much more water than a tiny cloud droplets.

D．The shape of the clouds have a great influence on the raindrop.

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第5题

What makes it rain？ Rain falls from clouds for the same reason anything falls to Earth. Th

e Earth's Gravity(重力) pulls it. But every cloud is made of water droplets or ice crystals. Why doesn't rain or snow fall constantly from all clouds？ The droplets or ice crystals in clouds are exceedingly small. The effect of gravity on them is minute. Air currents move and lift droplets so that the net downward displacement is zero, even though the droplets are in constant motion.

Droplets and ice crystals behave somewhat like dust in the air made visible in a shaft(束) of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about wildly without fixed direction. But in fact dust particles are much larger than water droplets and they finally fall. The cloud droplet of average size is only 1/2,500 inch in diameter. (78)It is so small that it would take sixteen hours to fall half a mile in perfectly still air, and it does not fall out of moving air at all. Only when the droplet grows to a diameter of 1/125 inch or larger can it fall form. the cloud. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size large enough to fall out is the cause of rain.

What is the main topic of the passage？

A．The mechanics of rain.

B．The climate of North America.

C．How gravity affects air current.

D．Types of clouds.

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第6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7题

B Last fall was a first-of-its-kind season. I did not arrange （安排) any after-school clas

B

Last fall was a first-of-its-kind season. I did not arrange (安排) any after-school classes formy children. No swimming.'No music lessons. No play dates. Nothing.

Once they finished their homework, they were free to do what they pleased, but only onehour of TV. In the beginning, my sons, Ben, 11, and Nick, 9, were anxious about this sudden,unplanned freedom. I had to, push them out of the door with a ball, a bike, and so on. "Play？ Iordered.

I learned that this new plan takes time, patience and a lot of faith in the theory that havingexcellent grades isn't really important.

When my older kids, now in college and high school, were young, I brought in the rules ofmodern parenting. They are unspoken, but followed carefully. First, you must let your childhave a variety of activities. After all, you never know where you'll find a genius (天才). Second, if the child shows the slightest talent (才能), the activity must be pushed with lessons, special coaching (辅导) and practice of several days a week. Every minute should be taken and every minute has a purpose. That was really too much for my children.

Now with the new plan, we told stories, We listened to music. And' the. kids played with bikes, balls, and whatever was handy. Nobody kept score. In fact, the boys played outside so much that the lawn was worn down to the soil in places. They've made friends with those who come from all over the neighbourhood to play games.

We like those peaceful evenings. Ben and Nick have a good time this fall, MaYbe that's because the time offhas allowed us to enjoy each other's company;

40.What was new for the family last fall？

A. The children began to learn music when school was over.

B. The writer arranged no' extra lessons for the children.

C.The writer found no time to play with the sons.

D. The children had nothing toclo alter schooli

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第8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9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10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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