题目内容
在程序的每个空白处填写一条适当的语句，使程序完成相应的操作。程序实现的功能是：窗体上有文本框Text1和若干复选框，其中复选框Check1设置文本框Text1显示的文本是否加下划线。Check1的单击事件过程如下：Private Sub Check1_Click() If______ Then Text1.FontUnderline=Tree ElseIf______Then Text1.FontUndefiine=False End IfEnd Sub
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Passage Four In most American cities, the tent for a one-bedroom apartment was $250 or more per month in recent years. In some smaller cities such as Louisville, Kentucky or Jacksonville, Florida the rent was less, but in larger cities it was more. For example, if you lived in Los Angeles, you had to pay $400 or more to rent a one-bedroom apartment, and the same apartment rented for $625 and up in Chicago. The most expensive rents in the U. S. were in New York City, where you had to pay at least $700 a month to rent a one-bedroom apartment in most parts of the city. Renters and city planners are worried about the high cost of renting apartments. Many cities now have rent-control laws to keep the cost of renting low. These laws help low-income families who cannot pay high rents. Rent control in the United States began in 1943 when the government imposed rent controls on all American cities to help workers and the families of soldiers during World War II. After the war, only one city—New York—continued these World War II controls. Recently, more and more cities have returned to rent controls. At the beginning of the 1980s, nearly one fifth of the people in the United States lived in cities with rent-control laws. Many cities have rent-control laws, but why are rents so high Builders and landlords blame rent controls for the high rents. Rents are high because there are not enough apartments to rent, and they blame rent controls for the shortage of apartments. Builders want more money to build more apartment buildings, and landlords want more money to repair their old apartment buildings. But they cannot increase rents to get this money because of the rent-control laws. As a result, landlords are not repairing their old apartments, and builders are not building new apartment buildings to replace the old apartment buildings. Builders are building apartments for high-income families, not low-income families, so low-income families must live in old apartments that are in disrepair. Builders and landlords claim that rent-control laws really hurt low-income families. Many renters disagree with them. They say that rent control is not the problem. Even without rent controls, builders and landlords will continue to ignore low-income housing because they can make more money from high-income housing. The only answer, they claim, is more rent controls and government help for low-income housing. It can be inferred from the passage that rent controls ______.
诊断再生障碍性贫血最有价值的检查是
白血病患儿出血的主要原因是
缺乏叶酸和维生素B12发生贫血的主要机制是
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