Early this year,Captain Startup was flying an aeroplane over

Early this year,Captain Startup was flying an aeroplane over New Zealand.
There was a television camera crew on board.Suddenly,out in the night sky,a
bright sphere came into view.Everyone on board saw it and everyone thought,
"UFO" -- Unidentified Flying Object.Many people believe that a UFO
is a visiting craft from outer space.The camera crew went into action and
started filming.That week people all over the world saw the film of this
mysterious light on their television screens.Someone described the object as
"a shining ping pong ball".What was it?Was it a spaceship full of
visitors from another planet?The Captain and the film crew believed it was.
Other observers had many different explanations.Some say it was Venus.Some
say it was just a trick of light.The people on the aeroplane were not the only
ones who saw the "UFO".An air traffic controller also saw it on his
radar screen.When a reporter asked him if he believed in UFO,he said,"I
don't know what they are,but I' ve got an open mind on them." Like many
scientists,he thought that a flock of birds caused 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
is very bright and easy to see.And from a moving aeroplane it can appear to be
moving fast.So far there is no proof that UFOs or spaceships from other
planets do exist.
16.The UFO the people on board the plane
saw is_________.A.a long object B.a
square object C.a round object D.
a short object 17.Which of the following statements is NOT
true?A.The captain believed that the UFO was
visiting craft from outer space.B.The camera crew believed that the UFO
was visiting craft from outer space.C.The air traffic controller believed that
the UFO was visiting craft from outer space.D.Many people believed that the UFO was
visiting craft from outer space.18.Which of the following possibilities is
NOT mentioned?A.The UFO was from outer space.B.The UFO was another plane.C.The UFO was an unusual effect of
light.D.The UFO was Venus.19."I don' t know what they are but
I' ve got an open mind on them" (in the second paragraph) probably means
that______.A.he believes the UFO comes from outer
space B.he disbelieves the UFO comes from outer
space C.he neither believes nor disbelieves that
the UFO comes from outer space D.he agreed with most of the people 20.According to the passage,the writer
probably means to say that_______.A.UFO doesn't really exist B.UFO is really unidentified C.UFO comes from outer space D.UFO is only people's imagination

C C B D A