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读下面这段文字，完成题目。

　　上海世博会隆重开幕了！从这一刻起，“城市，让生活更美好”的主题，将体现到来自全球的精采展示之中，贯穿于184个日日夜夜。这一曾经和中国彼此遥望的人类文明盛事，将隆重写入中国历史。她饱蘸底蕴深厚的“中国红”，演译一个绚丽多姿的中国传奇。

（1）注音：博：______；绚：______

（2）改正错别字：______改为______；______改为______

答案

（1）bó　xuàn

（2）“采”改为“彩”；“译”改为“绎”

填空题

辨字组词。

迫(           )               努(           )              箱(           )

追(           )               怒(           )              厢(           )

秒(           )               漆(           )              竖(           ) 

妙(           )               膝(           )              坚(           )

驮(           )               踪(           )              掏(           )

驼(           )               棕(           )              淘(           )  

霄(           )               乞(           )              睁(           )

宵(           )               气(           )              挣(           )

炼(           )               灌(           )              冶(           )

练(           )               罐(           )              治(           )

跪(           )               盆(           )              换(           )

脆(           )               盘(           )              唤(           )
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单项选择题

The usual way to ensure reliable delivery is to provide the (71) with some feedback about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special (72) frame bearing positive or negative (73) about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows the the frame has arrived safely. On the other hand, a negative acknowledgement means that something has gone wrong, and the frame must be transmitted again.
An additional complication comes from the possibility that hardware troubles may cause a frame to (74) completely. In this case, the receiver will not react at all, since it has no any reason to react. It should be clear that a protocol in which the sender transmits a frame and then waits for an acknowledgement, positive or negative, will hang forever if a frame is ever lost due to, for example, (75) hardwareo

A．acting

B．working

C．malfunctioning

D．functioning
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