view.Everyone on board saw it and everyone thought，"UFO"-Unidentified Flying Object.The camera crew went into action and started filming.That week people all over the world saw the film of the mysterious light on their television screens.What was it？Was it a spaceship full of visitors from another planet？The captain of the airplane and the film crew believed it was.Other observers had many different explanations.Some said it was Venus(金星)．Others said it was just a trick(幻影)of light.

　　 An air traffic controller also saw it on his radar screen.He thought that a flock(一群)of birds were causing dots on his radar screen when the"UFO"appeared.

　　 Most astronomers now believe that what these people saw was almost certainly the planet Venus.At that time of year it was very bright and easy to be seen.And from a moving airplane it can appear to be moving fast.So far there is no proof that UFOs or spaceships from other planets do exist.These years investigators of UFOs have investigated thousands of sightings or occasions when people said they saw a UFO.Ninety percent of these turned out to have a simple explanation.

　　 However，it is a good idea to keep an open mind.Scientists in some countries are trying to persuade their governments to help them study UFOs.And they are planning to cooperate internationally on reporting and investigating sightings of UFOs.

　　After all，it is quite possible that there is life out there in the universe.And if something is alive，it is quite possible that it will come to visit us.

　　【语篇解读】　一组电视摄影人员在空中看到了一个"UFO"，并对此物进行了拍摄，由此引发了大家对此物到底是什么的讨论。

　　4．From the first paragraph，we can know that ．

　　A．a television camera crew and some astronomers

　　were on board the airplane when the"UFO"appeared

　　B．they saw the"UFO"in the daytime

　　C．the"UFO"is bright at night

　　D．there are different opinions about Venus

C　[细节理解题。由第一段第三、四句"Suddenly，out in the night sky，a bright sphere(球体)came into view.Everyone on board saw it and everyone thought，'UFO'