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Most people do not think of fishes and other sea animals as having voices, and of those who are aware of the fact that many of them can "speak", few understand that these "conversations" have significance. Actually, their talk may be as meaningful as much of our own. For example, some sea animals use their "voices" to locate their food in the ocean expanses (广阔的区域); others use their "voices" to let their fellows know of their locations; and still others, as a means of obtaining mates. Sometimes, "speaking" may even mean the difference between life and death to a sea animal. It appears in some cases that when a predator (食肉动物) approaches, the prey (被捕的动物) depends on no more than the sounds it makes to escape.Fish sounds are important to man, also. By listening to them, he can learn a great deal about the habits of creatures that make them, the size of the School they form, the patterns of their migrations, and the nature of the environments in which they live. He can also apply this information to the more effective utilization of the listening spots he has set up to detect enemy submarines (潜水艇). A knowledge of fish sounds can avoid confusion and unneeded effort when a "new" sound is picked up and the sound sentry (哨兵) must decide whether or not to call an alarm. Among the people who know that many sea animals have voices, few （）
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In 1957 a doctor in Singapore noticed that hospitals were treating an unusual number of influenza-like (像流感的) cases. Influenza is sometimes called "flu" or a bad cold". He took samples from the throats of patients and in his hospital was able to find the virus (病毒) of this influenza.There are three main types of the influenza virus. The most important of these are types A and B, each of them having several sub-groups. With the instruments at the hospital the doctor recognized that the outbreak was due to a virus group A, but he did not know the subgroup. He reported the outbreak to the World Health Organization in Geneva. W.H.O. published the important news alongside reports of a similar outbreak in Hong Kong, where about 15-20% of the population had become ill.As soon as the London doctors received the package of throat samples, they began the standard tests. They found that by reproducing itself at very high speed, the virus had multiplied more than a million times within two days. Continuing their careful tests, the doctors checked the effect of drugs used against all the known sub-groups of type A virus on this virus. None of them gave any protection. This then, Was something new: a new influenza virus against which the people of the world had no ready help whatsoever.Having isolated the virus they were working with, the two doctors now conducted tests on some specially selected animals, which contact influenza in the same way as human beings do. In a short time the usual signs of the disease appeared. These experiments revealed that the new virus spread easily, but that it was not a killer. Scientists, like the general public, called it simply "Asian" flu. After some experiments, the doctors found that ()
Questions 22-27Complete the summary below.Choose NO MORE THAN TWO WORDS from the passage for each answer.A research on SIV has been launched by some scientists who have done experiments on numerous animals, first with collections of animals’ (22) , then scientists receiving information about animals’ infection by drawing (23) . They have established links of strains with (24) again. So, it is evident after the analysis of strains that times for which (25) choose the variety of animals is much more than that of human malaria. As a consequence, it is fairly easy for HIV to find suitable inhabits for humans and their relatives are alike in (26) . But it is concerned that (27) has been invaded by human malaria strains and new virus would be born from both human and their relatives. 23（）
The student who wants a newspaper career has much hard work ahead of him before he can become even a cub, or beginning reporter. He may begin by working on his high school newspaper or yearbook.Then the aspiring (有志的) reporter may break into newspaper work as a copyboy, running errands and helping sta. ff reporters. He may even be given a chance to write small stories. Sometimes students who are interested in news reporting can get jobs as campus reporters for local newspapers.Jobs such as these serve to acquaint the beginner with the atmosphere of newsgathering. They give him a chance to sharpen his eye for details and teach him to be sure that his facts are accurate, that he reports them correctly, and that he writes his articles clearly. This work may lead to a job as a cub reporter on a newspaper, the important first step toward a career in news reporting. A cub reporter is another name for a （）
A．believeB．pieceC．fieldD．friend
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