请阅读短文，完成第题。Do who choose to go on exotic， far-flung hol-找考题网

请阅读短文，完成第题。
Do who choose to go on exotic， far-flung holidays deserve free health advice before they travel? And even if they pay， who ensures that they get good， up-to-date information? Who， for that matter， should collect that information in the first place? For a variety of reasons， travel medicine in Britain is a responsibility nobody wants. As a result， many travellers go abroad prepared to avoid serious disease.
Why is travel medicine so unloved? Partly there's an identity problem. Because it takes an interest in anything that impinges on the health of travellers， this emerging medical specialism invariably cuts across the traditional disciplines. It delves into everything from seasickness， jet lag and the hazards of camels to malaria and plague. But travel medicine has a more serious obstacle to overcome. Travel clinics are meant to tell people how to avoid ending up dead or in a hospital when they come home， but it is notoriously difficult to get anybody pay out money for keeping people healthy.
Travel medicine has also been colonized by commercial interests; the vast majority of travel clinics in Britain are run by airlines or travel companies. And while travel concerns are happy to sell profitable injections， they may be less keen to spread bad news about travellers' diarrhea in Turkey， or to take time to spell out preventive measures travellers could take.'The NHS finds it difficult to define travellers' health， says Ron Behrens， the only NHS consultant in travel and director of the travel clinic of the Hospital for Tropical Diseases in London.' Should it come within the NHS or should it be paid for? It's Gary area， and opinion is spilt. No one seems to have any responsibility for defining its role， he says.
To compound its low status in the medical hierarchy， travel medicine has to rely on statistics that are patchy at best. In most cases we just don't know how many Britons contract diseases when abroad. And even if a disease linked to travel there is rarely any information about where those afflicted went， what they are， how they behaved， or which vaccinations they had. This shortage of hard facts and figures makes it difficult to give detailed advice to people， information that might even save their lives.

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【参考答案】

A
文章第一段讲到，因为种种原因，在英国，旅游医疗是没有人愿意承担的责任。于是，许多旅游者在出门前都得仔细贮备一些药品以防旅途中出现疾病困扰。由此可推知，旅行医疗很难盛行起来。

未分类题请阅读短文，完成第题。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 ofhigh 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.