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问题 单项选择题

人的运动规律人走路过程中，当脚步迈出时身体的高度就降低，当一只脚着地而另一只脚向前移至两腿相交时身体的高度就升高，整个身体呈：（）

A、弧形运动

B、波浪型运动

C、“S”型运动

D、直线行运动

答案

参考答案：B

单项选择题

One ofthe main resposibilities ofICMP is to report  （） . Although technology hasproduced increasingly relaible transmission media, errors still exist and must be handled. IP isan  （）  protocol. This means that error checking and error control are not a concem ofIP. ICMP was designed, in part, to compensate for this shortcoming. Howerver, ICMP doesnot  （） errors, it simply report them. Error correction is left to the higher-levelpotocols. Error messages are always sent to the original  （）  because the only informationavailable in the datagram about the route is the source and destination IP addresses. ICMP usethe source IP address to sent the error massage to the source ofthe（）.

ICMP usethe source IP address to sent the error massage to the source ofthe（）.

A．datagram

B．frame

C．service

D．protocol
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选择题

People were ______ to see the teachers put on the play in such a professional way. [ ]

A. shocked  

B. exhausted   

C. confused  

D. amazed
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