1.Supernovae____（report） by astronomers in the seventeenth and eighteenth centuries.
2.Imagine the earth reduced to the size of a marble， but still____（have） the same mass， and you have some idea of the force of a black hole.
3.If one____（make） a journey over the Continents one would find every kind of surface including mountain ranges， plains， and empty areas covered permanently by ice and snow.
4.And astronomers are planning a new observatory to study the individual exploding stars____（believe） to be black holes.
5.Matter from the one which we can see____（pull） towards the companion star.
6.There might be a massive black hole at the centre of our galaxy____（swallow） up stars at a very rapid rate.
7.The most____（convince） evidence of black holes comes from research into binary star systems.
8.They show us a world which operates in a ____（total） different way from our own.
9.The surface of some areas____（consist） largely of high mountains and deep valleys.
10.Our world is the home of a very great many different people-peoples with different____（colour） skins.
Ⅲ Vocabulary and Structure
1.Astronomers and scientists think that a black hole is a region of space （not a thing）____which matter has fallen and____which nothing can escape-not even light.
[A] into into
[B] into from
[C] from into
[D] from from
2.This process of shrinking may be so intense____a black hole results.
[A] whether
[B] what
[C] which
[D] that
3.Binary stars，____their name suggests， are twin stars whose position in space affects each other.
发表于 2007-10-16 18:25:03