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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：2020-09-17

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

Scientists are sure thatA．the number of the whales is rising slowly by a small percentage.

Scientists are sure that

A．the number of the whales is rising slowly by a small percentage.

B．greater scrutiny of the whale population explains the growing number.

C．the whales are in an irrevocable decline despite all their efforts.

D．the whales have other summer habitats besides Sakhalin’s offshore.

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第2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

Then one found it difficult to believe that one would fall all the way down to the center ofthe eart

h without gravity.

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第5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6题

Should the content of Tribasic Phosphate of Lime fall below the guaranteed 72%, an allowance on the

basis of 2% of the sales price for each unit shall be calculated and deducted from the purchase price fractions(14)． Should the content of Tribasic Phosphate of Lime fall below 70%, the Buyers have the right to refuse the cargo． In such case, all the losses and expenses arising therefrom shall be borne by the Sellers, or(15)the price shall be renegotiated．

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第7题

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

probably a lot sharper in the spring than you are at any other time of the year. A well-known scientist, Ellsworth Huntington (1876-1937), concluded from other men's work and his own among people 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. 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 the 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!

1). Huntington based his conclusions on ___________.

A. work with people in different climates

B. records of temperature changes

C. records of change in his own intelligence

D. all of the above

2). Ellsworth Huntington decided that climate and temperature have _________.

A. a great effect on everyone's intelligence

B. no effect on people's intelligence

C. effect on only a few people's intelligence

D. some effect on most people's intelligence

3). One possible reason why spring is the best season for thinking is that ___________.

A. there are some things making all nature different from before

B. it is neither too warm nor too cold

C. it is more natural for the development of mental abilities

D. it lasts longer than the other seasons

4). The two best seasons for thinking seem to be _____________.

A. winter and summer

B. fall and winter

C. spring and fall

D. summer and spring

5). According to the passage above, vacations from thinking should be taken ___________.

A. as seldom as possible

B. during spring and fall

C. several times throughout the year

D. during the summer

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第8题

A couple from Miami, Bill and Simone Butler, spent sixty-six days in a life-raft(救生

A couple from Miami, Bill and Simone Butler, spent sixty-six days in a life-raft（救生

艇) in the seas of Central America after their boat sank.Twenty-one days after they left Panama in their boat, Simony, they met some whales(鲸鱼). “They started to hit the side of the boat,” said Bill, “and then suddenly we heard water.” Two minutes later, the boat was sinking. They jumped into the life-raft and watched the boat go under the water. For twenty days they had tins of food, biscuits, and bottles of water. They also had a fishing-line and a machine to make salt water into drinking water — two things which saved their lives. They caught eight to ten fish a day and ate them raw(生的). Then the line broke. “So we had no more fish until something very strange happened. Some sharks(鲨鱼) came to feed, and the fish under the raft were afraid and came to the surface. I caught them with my hands.”About twenty ships passed them, but no one saw them. About twenty ships passed them, but no one saw them. After fifty days at sea their life-raft was beginning to break up. Then suddenly it was all over. A fishing boat saw them and picked them up. They couldn’t stand up. So the captain carried them onto his boat and took them to Costa Rica. Their two months at sea was over. During their days at sea, _______ saved their lives

A、tins of food and bottles of water

B、a fishing-line and a machine

C、whales and sharks

D、Twenty passing ships

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第9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10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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