【正文】 alifornia39。s also an Americanization of Latinos. By third generation, a lot of them are losing their Spanish, they prefer American NFL to soccer.” Overall, nearly 65 percent of all Hispanic mothers were immigrants, ranking themsecond to Asian and Pacific Islanders at more than 84 percent. The b 大量的管理資料下載 大量的管理資料下載 abies tend to grow up healthy as well. Studies have shown that at virtually all stages of life, Hispanics, at least in California, Arizona and Texas, tended to suffer fewer major health problems, such as heart attacks, cancer and strokes, than other ethnic groups, HayesBautista noted. Only about 15 percent of Hispanic mothers were 19 years old or younger. By parison nearly 17 percent of Blacks and 19 percent of American Indians were teenagers. NonHispanic Whites had a figure of nearly 7 percent. 41. Hispanic mothers had of the babies born in California in 1998. 42. David HayesBautista believes that . will bee the backbone of future Californian economy white culture will dominate California39。s edition of the journal Nature. Replacing a keyboard or mouse, eyescanningcameras mounted on puters have become necessary tools for people without limbs or thos 大量的管理資料下載 大量的管理資料下載 e affected with paralysis. The camera tracks the movement of the eye, allowing users to“ty pe”on a virtual keyboard as they look at the screen. And now, researchers from the Cavendish Laboratory at Cambridge University say they have developed software that replaces the standard QWERTY keyboard layout with ohat is nearly twice as efficient, more accurate and easier on the eyes. CalledDasher, the prototype program tapssintosthe natural gaze of the eye and makes predictable words and phrases simpler to write. Any offtheshelf camera capable of scanning eye movement can be used with Dasher, though the person must sit fairly still during the interaction. The letters of the alphabet appear in a single column on the right of the screen, with an underscore symbol to represent a space. Each letter is framed by a colored box. As the user looks at a particular letter on the right side of the screen and drags it to the left with their eye, another subalphabet column begins to emerge inside the box on the righthand side, along with more letters framed in colored boxes. Dasher is designed t 大量的管理資料下載 大量的管理資料下載 o anticipate which letter will be needed, so although the successive subalphabet columns are initially very small, the letters or bination of letters that simultaneously appear are most likely to be used next in that sequence. For example, if a person starts with the letter“h,”the language models in Dasher will bring up“a,” “e,”“i,”“o”and“u”in the subalphabet box, along with a few other possible binations like“ello”to form the word“hello.”Each box has a plete alphabet within it, though the firstletters to appear have the highest probability of usage. The letters are then placed together to form a sentence on the left side of the screen. Researchers say people will be able to write up to 25 words per minute with Dasher pared to onscreen keyboards, which they say average about 15 words per minute. With a bit of practice, MacKay said, Dasher offers an easier and more satisfying way for disabled people to municate, providing them with better tools to write or creat 大量的管理資料下載 大量的管理資料下載 e word processor files. MacKay said Dasher could work inmost languages. 51.“Paralysis”(paragraph 1, line 4) is probably . sightedness ility to move blindness 52. With the new software Dasher, people can type with their eyes puter screen with eyescanning sensors eyescanning camera on puter colored box attached to the puter regular keyboard with sensors 53. The new method of typing will most benefit those people who reading difficulties physically challenged visually inpetent 大量的管理資料下載 大量的管理資料下載 not have a big vocabulary 54. The software Dasher . able to predict the next sequence of words the user is going to write not allow the user to move a lot during the interaction to be used with eyescanning cameras specially designed for the software form coherent sentences based on the first word typed in by the user 55. Which of the following is true about Dasher? can be used to write 15 more words than keyboard. is easier to use than ordinary keyboards. can provide hints for possible letters to be written. is an independent text processor. 大量的管理資料下載 大量的管理資料下載 Passage Four Federal researchers are crediting sexual abstinence and increased contraception use as the main reasons for the recent declines in teen pregnancy, abortion and birthrates. The teenpregnancy rate fell to a record low in 1997, reflecting a slide in pregnancy, abortion and birthrates that began earlier in the decade, sayresearchers with the National Center for Health Statistics (NCHS). The 1997 teenpregnancy rate, the most recent figure available, was 94.3 pregnancies per 1,000 teens ages 15 to 19, or 872,000 pregnancies. This is 19 percent lower than the teenpregnancy rate in 1991, when the rate peaked at pregnancies per 1,000 teens. This also is the lowest rate since 1976, when consistent collection ofnational pregnancy rates began. Jennifer Manlove, a researcher with Child Trends Inc., thinks teenpregnancy rates may continue to fall since abortion rates have been declining and teen birthrates fell in both 1998 and 1999. Pregnancy rates are based on the number of livebirth 大量的管理資料下載 大量的管理資料下載 s, induced abortions and fetal losses, such as miscarriage or stillbirth. In 1997, the teenpregnancy rate included live births, abortions and 1 fetal loss