[单选题]请阅读短文，完成此题。 When we analyze the salt salinity(盐溶度 ) of ocean waters, we find that it varies only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation. In this manner, the salinity is increased, since the salt stays behind. If this is carried to the extreme, of course, white salt would be left behind; this, by the way, is how much of the table salt we use is actually obtained. The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by-evaporation, or decreased by the addition of fresh water by precipitation. Normally, in hot regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas. A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water. In the Weddell Sea, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portion of the oceans of the world. Which of the following is not the cause of the decrease in the oceanic salinity? 查看材料
A.Precipitation.
B.Rain and snow.
C.Formation of ice.
D.Addition of water by rivers.

[单选题]请阅读短文，完成此题。 When we analyze the salt salinity(盐溶度 ) of ocean waters, we find that it varies only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation. In this manner, the salinity is increased, since the salt stays behind. If this is carried to the extreme, of course, white salt would be left behind; this, by the way, is how much of the table salt we use is actually obtained. The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by-evaporation, or decreased by the addition of fresh water by precipitation. Normally, in hot regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas. A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water. In the Weddell Sea, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portion of the oceans of the world. The purpose of mentioning the Weddell Sea is__________. 查看材料
A.to give an example of cold-water salinity
B.to point out the location of deep waters
C.to make a comparison between hot-water salinity and cold-water salinity
D.to show that the water in the Weddell Sea varies in salinity from place to place

[单选题]请阅读短文，完成此题。 When I read last week that Angela Ahrendts was getting up to $68m as a welcome gift forjoining Apple, my mind skipped at once to her husband. This latest addition to her vast stash ofmoney must catapult her spouse Gregg to the very top of the global my-wife-earns-more-than-meleague table. It is quite an achievement. I have no idea if the two of them like each other, but they havestuck it out for a long time. They met at school and he chucked his job to follow her to the UKwhen she became head of Burberry; he seems to have spent the last eight years mainly looking aftertheir three children, revamping their home and putting supper on the table for her when she finallystaggered in on her five-inch heels. I suspect the real genius of Ms Ahrendts lies less in the wayshe persuaded people to buy 22,000 raincoats with peacock feather trims than in persuadingGregg to marry her--and to stick with her ever since. It is no longer particularly rare for women to be the main breadwinner--in the US a quarter ofwives now earn more than their husbands--but what is rarer is for such a relationship to work. A book published last week by the journalist Farnoosh Torabi draws together data showing just howhard it is: high-earning women have difficulty finding a husband, and when they do, he is five timesas likely to be unfaithful as other husbands. The woman will probably do more than her share ofchores; though in the unusual event that he starts ironing and cooking, he is likely to end upfeeling so unmanly. Either way, divorce beckons. If I think of my many female friends who have out-earned their husbands, a suspiciously largenumber are divorced. One friend complained that she no longer knew what her husband was for ashe neither made much money nor showed any desire to help out at home. Hardly surprisingly, hisversion of events was different: as she insisted on dominating both at work and at home, he'd beenleft un-manned and without a role. ! know of only two sets of good friends where the woman earns more and where the marriageseems solid. In one there are no children, so the two spend their spare time being nice to eachother. In the second, the man is so good at child-rearing and cooking while the woman is sohopeless around the house, so everyone seems happy. The majority of colleagues, even very young ones, still seem to be in relationships where theman makes more. One fiercely clever young male colleague says his equally clever feministgirlfriend has told him she could never marry a man who earned less as she didn't fancy a lifespent propping up his ego. Which of the following is not the problem when the wife earns more than her husband? 查看材料
A.The man may be more likely to be unfaithful than other husbands.
B.The woman will probably do more than her share of housework.
C.The man will feel that he is badly in need of manliness.
D.The wife may look down on her husband.

[单选题]请阅读短文，完成此题。 We've got it all wrong, says Carlos Slim, the Mexican telecoms tycoon and world's second-richest man: we should be working only three days a week. Attending a business conference inParaguay, Mr. Slim said it was time for a"radical overhaul" of people's working lives. Instead of being able to retire at 50 or 60, he says, we should work until we are older--but take more time off as we do so. "People are going to have to work for more years, until they are 70 or 75, and just work three days a week--perhaps 11 hours a day," he told the conference, according to Paraguay.com newsagency. "With three work days a week, we would have more time to relax for quality of life. Havingfour days(off) would be very important to generate new entertainment activities and other ways ofbeing occupied." The 74-year-old self-made magnate believes that such a move would generate a healthier and more productive labour force, while tackling financial challenges linked to longevity.He is putting his money where his mouth is. In his Tehnex fixed-line phone company in Mexico,where workers on a collective labour contract who joined the company in their late teens areeligible to retire before they are 50, he has instituted a voluntary scheme allowing such workers tokeep working, on full pay, but they only need to work four days a week. Mr. Slim stunned the Mexican business world this month with plans to break up his Am6ricaM6vil empire, selling about a fifth of its assets, in order to avoid regulatory sanctions. Hiscompanies dominate 80 per cent of the fixed-line and 70 per cent of the mobile markets inMexico--above a new 50 per cent threshold. The magnate is a keen strategist and philanthropist,who has often said what he likes to do best is to think. He has cultivated interests outside thecorporate world: his passion for Rodin sculpture and art collecting is evident in the Soumaya museum in Mexico City dedicated to his late wife. Another of his deep-held beliefs is that education should be rethought. He told the conference in Paraguay that it should "not be boring, but should be fun" and should teach people "not to memorize but to reason; not to domesticate but to train". He also called for more vocationaltraining. Mr. Slim, who is at the age of 74 already, meanwhile, appears to have no plans to retire. "Look at who he respects: the (Mexican) banker Manuel Espinosa Yglesias was something of amentor, and he was still working in his late 80s," said Andrew Paxman, a British historian who iswriting a book about Mr. Slim. The best title of the passage may be 查看材料
A.Carlos Slim Calls for a Three-day Working Week
B.People Favour a Three-day Working Week
C.Working Three Days a Week Is with Advantages
D.Working Three Days a Week Will Be Implemented

[单选题]请阅读短文，完成此题。 Back in the old days, when I was a child, we sat around the family round table at dinnertime and exchanged our daily experiences. It wasn't very organized, but everyone was recognized and all the news that had to be told was told by each family member. We listened to each other and the interest was not put-on; it was real. Our family was a unit and we supported each other, and nurtured each other, and liked each other, and--we were even willing to admit--we loved each other. Today, the family round table has moved to the local fast-food restaurant and talk is not easy, much less encouraged. Grandma, who used to live upstairs, is now the voice on long distance, and the working parents far too beaten down each day to spend evening relaxation time listening to the sandbox experience of an eager four-year-old. So family conversation is as extinct as my old toys and parental questions such as "What have you been doing, Bobby?" have been replaced by "I'm busy, go watch television. "And watch TV they do; count them by the millions. But it's usually not children's television that children watch. Saturday morning, the children's hour, amounts to only about 8 percent of their weekly viewing. Where are they to be found? Watching adult television, of course, from the Match Game in the morning, to the afternoon at General Hospital, from the muggings and battles on the evening news right through the family hour and past into Star sky and Hutch. That's where you find our kids, over five million of them, at 10 p.m., not fewer than a million until after midnight! All of this is done with parental permission. Television, used well, can provide enriching experiences for our young people, but we must use it with some sense. When the carpet is clean, we turn off the vacuum cleaner. When the dishes are clean, the dishwasher turns itself off. Not so the television, which is on from the sun in the morning to the moon at night and beyond! Parents must exercise some control and show some concern about the cultural influence on the child when a program not intended for that child is viewed. Parents need to intervene. Nonintervention may be a wise policy in international affairs, but the results of parental nonintervention will not be wise at all. What is the main idea of the last paragraph? 查看材料
A.Parental nonintervention will not be praised.
B.Nonintervention may be a good policy in international affairs.
C.Parents must exercise some control and show some concern about the cultural influence on the children.
D.Parents need to intervene.