TCP/IP参考模型中最底层是______。

UFO  Reports
Date	Time	Places	Description(描述)
January 14,2007	00:24	Leeds	There were two bright lights (发光体).They were round and orange in color.
February 4,2007	20:00	Bridlington North Bay	A group of lights in the sky were moving to the west.They seemed to move slowly.
February 15,2007	01:00	Selby	A white light was moving slowly in the direction(方向) of Hull.It looked like it was floating(漂浮).
February 23,2007	19:45	Eastleigh	The light was bright green in color, and it looked like a rocket.It was high in the sky and was traveling fast.
December 24,2007	21:20	Whitstable	There were three bright, orange lights in the sky, and then a fourth orange light came out and followed the other three.

小题1: Someone saw a group of lights in the sky moving to the west at ____.

A．12:24 am on January 14

B．1:00 am on February 15

C．8:00 pm on February 4

D．9:20 pm on December 24

小题2:There were more reports about UFOs in _____ than in other months.

A．January	B．February
C．December	D．January and December

小题3: What happened on February 23?

A．Three bright lights were seen in the sky.

B．The person saw something that looked like a rocket.

C．Something strange happened in Selby.

D．A white light was moving slowly.

小题4:Where would you probably read the reports?

A．On the radio.

B．On a TV show.

C．On the Internet.

D．In a clothes store.

小题5:We can learn from the passage that UFOs ________.

A．all have the same shape

B．always have the same color

C．all have the same speed(速度)

D．usually have bright lights