题目内容
It hasn't always been this way. "Leisure time" was almost unknown in the United States in the eighteenth and nineteenth centuries. When most people worked on farms, the workday was from sunrise to sunset every day except Sunday, which was devoted to church. Later, with the rise of factories and city populations, people worked equally long hours and had only Sunday for rest. Some people did more of the things than that they do now—attend concerts, have parties, go to restaurants, read novels, or play, sports—but to a much lesser extent.
Slowly, throughout the twentieth century, leisure time grew. Technology made farm work less burdensome, and changes in laws shortened the factory work day and week. New inventions such as the phonograph(留声机)and the radio gave people access to music and mass entertainment on a scale unknown before. People gradually became consumers of entertainment, and businesses competed fiercely for their dollars.
For many people leisure time means going somewhere—to a museum, to a concert, to a restaurant, or to a baseball game, for example. Or it means doing something such as playing volleyball, backpacking, swimming, biking, or playing in a park with their children. For other people free time means staying home with wonderful sources of entertainment, such as a VCR, stereo (立体声系统) , or cable TV with dozens of channels. Others pursue creative activities such as cooking, gardening, and home improvement. The latest stay-at-home activity is "surfing the net"—that is looking for information and entertainment on the Internet.
People in the United States are basically not much different from others in what they do in their leisure time. The real difference may lie in the energy, time, money, and sheer enthusiasm that they devote to it.
"Couch potatoes" in Paragraph 1 refers to those who ______.
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There are basic guidelines to bear in mind. First, don't use as a password your name or that of a member of your family, even in modified form. Also avoid use of your telephone number, your Social Security number, or your address. Such information can easily be obtained by a determined hacker (黑客).
In addition, if possible, don't use passwords made up entirely of letters or digits. A relatively simple computer program can crack such a code quickly: Finally, do not use a word that can be found in any dictionary, even a foreign-language one. Huge lists are available that contain words, place names, and proper names from all languages. Programs can test for variations of these words, such as if they are spelled backward, capitalized, or combined.
So, what kinds of passwords should be used？ Usually ones that have a minimum of six to eight characters and that have a mixture of upper-and lower-case letters, digits, and punctuation (标点) symbols. How difficult is it to crack such a combination of characters？ One source says that "a machine that could try one million passwords per second would require, on the average, over one hundred years."
How can you choose a combination that is easy to remember？ Some suggest that you take the title of a favorite book or film or a line from a song or poem and use the first latter from each word as your password, adding capital letters, punctuation, or other characters. For example, "to be or not to be" could become "2B/not2B".
Other suggestions include taking two short words and link them with a punctuation character, such as "High？Bug" or "Song; Tree".
Taking into account the suggestions outlined above can help you to protect important information from unwanted hackers. Remember, too, the importance of changing your passwords regularly. Just a final comment, whatever passwords you decide to use, don't pick any of the examples given above.
What is the main idea of this passage？
【B3】
某工厂污水排放量为75000m3/d，排入小型水库，则对于二级水环境影响评价，该湖泊布设一个取样位置的范围是()k2。
It was very difficult to build a power station in the deep valley, but it ______ as we had
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