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问题 单项选择题

Wondows是多任务栏操作系统，可以同时运行多个程序，如果要进行前后台的切换，可以按组合键_____ 。

A．Ctrl+Tab

B．Alt+Shift

C．Ctrl+Esc

D．Alt+Tab

答案

参考答案：D

听力题

根据短文内容和所给中文提示，写出空白处各单词的正确形式，每空限填空一词。

The 30th Olympic Games will be held in London from July 27 to August 12 this summer. It is the 小题1:_______(第三) time for London to hold the Olympics. People there are excited. They all help to prepare for it. They plant lots of flowers and 小题2:_________(树) to make the city beautiful. More and more people to go work by bus or by 小题3:_________(自行车). The city is now very 小题4:_______(干净的) and tidy. London is ready to小题5: ________(欢迎) people from different countries.

The weather will be 小题6:_______(凉爽的) by then. People around the world will 小题7:______(相逢，遇见) in London. They can not only watch the games but also take a 小题8:_______(短的) trip there. They can 小题9:________(参观) the British Museum and the National Gallery. It is also of great fun to enjoy the London Eye and Tower Bridge along the Thames, a beautiful 小题10:_______(河) in London. How wonderful it will be!
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单项选择题

某工业污水量为2000m3/d，悬浮物浓度C0=300mg/L，要求沉淀后出水的悬浮物浓度不超过60mg/L，则沉淀池的去除率应为（）。

A．60%

B．70%

C．80%

D．90%
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