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一、单项选择题：本大题共20小题，每小题2分，共40分。在每小题列出的备选项中只有一项是最符合题目要求的，请将其选出。 1．关于操作系统在计算机系统中的作用描述正确的是
A
A．操作系统连接了硬件和软件 B．操作系统连接了系统软件和应用软件 C．操作系统是硬件资源的管理者 D．操作系统是网络扩展机和网络虚拟机
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在Excel中，单元格A1,A2,A3中的内容为数值1，2，3。在单元格A4的编辑栏输入公式“=SUM(A1:A+12”并回车，A4单元格的内容为（ ）(1分)
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1.
Passage Three When you stretch out in the sun you can do one of the three things: you can use no sun tan oil, an ordinary sun tan oil; or Bergasol. If you don't use any sun tan oil when you're in the sun, you will burn surprisingly quickly. If you use an ordinary sun tan oil, you will protect your skin to a lesser or greater degree.How much protection depends on the "protection-factor number" on the bottle. Some oils block out so many of the sun's rays and you can stay in the sun all day without burning but you won't go very brown,either. Bergasol will protect your skin like an ordinary sun tan oil. It also has a tan accelerator that speeds up the rate at which the sun activates the skin cells that produce melanin(黑色素). It is melanin that gives the skin its brown colour. Bergasol enables you to go brown faster,am as the days pass the difference will become more obvious.Unfortunately, this special formulation isn't Cheap to prepare.So Bergasol is rather more expensive than ordinary sun tan oil. However, the price looks more attractive as you do. Bergasoi It makes you go brown faster Protection Many people imagine that "cover-up" means you don't get a tan. Nothing to show for your holiday. Not so. With "cover-up", you can get brown if you want to. The point of "cover-up" is to protect your skin from the harmful rays of the sun which, according to the experts ,make your skin look older. That's what Solex Cover-up is all about--protection for your skin. It has a Sun Protection Factor 8, which makes it suitable for anyone. Find out how it works for you by consulting the Solex Sun Chart. On sale wherever Solex is. With Solex Cover-up, you can tan as slowly as you like. As gently as you like. And with much less chance of peeling. Your tan will look better. Your skin will stay young longer. Solex Gentle tan.., full protection
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四、阅读理解(共15小题；每题3分，共45分。) 阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。
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三、简答题（本大题共 5 小题，每小题 6 分，共 30 分）
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There is still____ hope of our getting there in time. Let's hurry.
5.
已知cos (A+B)=m,tan A tan B=2，则cos (A-B)=____
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