题目内容
Questions 17—20 are based on the following talk about the language ability.Is language a basic human need without which a child at a critical period of life can be starved and damaged Judging from the experiment of Frederick in the thirteenth century it may be. Hoping to discover what language a child would speak if he heard no mother tongue, he told the nurses to keep silent. All the infants died before the first year.Today no such drastic deprivation exists. Nevertheless, some children are still backward in speaking. Most often the reason is that the mother is insensitive to the signals of the infant. There are critical times when children learn more readily. If these sensitive periods are neglected, the ideal time for acquiring skills passes and they might never be learned so easily again.Linguists suggest that speech milestone is reached in a fixed sequence and at a constant age. At twelve weeks a baby smiles and utters vowel-like sounds; at twelve months he can speak simple words and understand simple commands; at eighteen months he has a vocabulary of three to fifty words. At three he knows about 1,000 words which he can put into sentences, and at four his language differs from that of his parents in style rather than grammar.Recent evidence suggests that an infant is born with the capacity to speak. What is special about man’s brain is the complex system which enables a child to connect the sight and feel. And even more incredible is the young brain’s to pick out an order in language from the hubbub of sound around him, to analyze, to combine and recombine the parts of a language in novels.But speech has to be triggered, and this depends on interaction between the mother and child. Insensitivity of the mother dulls the interaction because the child gets discouraged and sends out only the obvious signals. Sensitivity to the child’s non-verbal cues is essential to the growth and development of language. What happened to the child in Frederick’s experiment().
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Many residential burglaries occur because of widespread misconceptions. For example, while people typically worry about nighttime thefts, almost half of residential break-ins happen during the day, when homes are vacant because owners are working. Moreover, robbing a house probably takes less time than many people think. "Most burglars get in and out in less than ten minutes," says Jean O’ Nell, director of research and policy at the National Crime Prevention Council in Washington, D.C. And thieves are well aware that, even for properties with sophisticated security systems, time is on their side. Police can take five to 45 minutes to respond to an alarm or call, especially in rural or suburban areas where they may have considerable distance to cover.To protect your home, you have to lock doors and windows when you go out, even if you’re just going out to walk the dog or have a quick chat with a neighbor down the streets. It’s easy to get sidetracked and be gone longer than you may have expected.More than half of all break-ins happen without force, in many cases through an unlocked door. So, also keep external doors bolted when you’re home. Supplement your locks with deadbolts having at least one-inch throws. If you have doors with glass panels, consider replacing the glass with polycarbonate plastic, which is transparent but break-resistant. Otherwise, a burglar can simply smash the glass and turn the lock. How soon will police respond to an alarm or call in rural or suburban areas().
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