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问题 单项选择题

A．It conserves battery power.

B．It lets your laptop rest.

C．It makes your laptop easy to control.

D．It replaces screen saver.

答案

参考答案：A

解析：What is the benefit sleep mode brings to the laptop

填空题

光在真空中的传播速度是______m/s，在同一种物质中，光是沿______传播的，光年是______的单位．
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单项选择题

The client with a total laryngectomy receives tube feedings to meet his fluid and nutrition needs. The nurse explains to the client that the purpose of the tube feedings is to

A. prevent pain from swallowing.
B. prevent fistula development.
C. ensure adequate intake.
D. allow for adequate suture line healing.
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