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一个UDP首部的信息(十六进制表示)为0xF7 21 00 45 00 2C E8 27。UDP数据报的格式如下图所示。试问：一个TCP连接要发送3200B的数据。第一个字节的编号为10010。如果前两个报文各携带1000B的数据，最后一个携带剩下的数据，请写出每一个报文段的序号。

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Questions 4 to 6 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. How many companies are presenting products in the Consumer Electronics Show

A. More than twenty thousand.
B. More than three thousand.
C. More than two hundred.
D. More than three hundred.

Questions 7 to 10 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. The passage mainly aims to ______.

A. explain why time flies when people have fun
B. prove time slows when having fun
C. explain brain activity when having fun
D. illustrate why time flies

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In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow. Questions 1 to 3 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. Which is INCORRECT about Dr. Ian Morgan’s suggestion on protecting young people’s eyes

A. Whatever the weather is, they should spend more time outdoors.
B. They should play outdoors and enjoy more sunlight.
C. Their academic pressure should be minimized.
D. Parents should take infants outdoors at noon rather than nap at this time.

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Questions 7 to 10 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. When can children set the table with impressive accuracy

After they learn to walk and talk.
B. After they could count things.
C. Before they could walk and talk.
D. Before they could count things.

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