历年考题：
1.Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and ______ which nothing can escape.
A.towards … towards B.into … from C.out of … from D.through… from
答案是B.考点：定语从句中介词+which 的结构；fall into 掉进去； escape from 从… 逃离。
2.汉译英：要说出黑洞里面发生了什么是不可能的。（不定式作主语）
答案：It is impossible to say what happens inside the black hole.
3.汉译英： 只是在最近天文学家才开始对黑洞进行具体研究。（强调句型）
答案：It is only recently that astronomers have begun specific research into black holes.
4.汉译英： 有些星辰的密度达到某一点就会爆炸。
答案：Some stars explode when their density increases to a certain point .
Unit 2 单元课后练习
Ⅰ Word Spelling
1.密度 n.d _ _ _ _ _ _ _ _
2.（使）倒塌，（使）崩溃 v.c _ _ _ _ _ _ _ _
3.边界线，边界 n.b _ _ _ _ _ _ _ _
4.永恒的，经久不变的 a.c _ _ _ _ _ _ _ _
5.基础，根据 n.b _ _ _ _ _ _ _ _
6.发射，发动 v.l _ _ _ _ _ _ _ _
7.双胞胎之一 a.t _ _ _ _ _ _ _ _
8.同伴，同事 n.c _ _ _ _ _ _ _ _
9.人类 n.m _ _ _ _ _ _ _ _
10.推测，猜测 n.s _ _ _ _ _ _ _ _
11.吞 v.s _ _ _ _ _ _ _ _
12.不充分的 a.i _ _ _ _ _ _ _ _
13.物质 n.m _ _ _ _ _ _ _ _
14.情况，环境 a.c _ _ _ _ _ _ _ _
15.发生，出现 v.o _ _ _ _ _ _ _ _
16.强烈的 a.i _ _ _ _ _ _ _ _
17.证据 n.e _ _ _ _ _ _ _ _
18.看不见的 a.i _ _ _ _ _ _ _ _
19.宇航员 n.a _ _ _ _ _ _ _ _
20.热带的 a.t _ _ _ _ _ _ _ _
Ⅱ Word Form
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.
ⅢVocabulary 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.
[A] as
[B] that
[C] what
[D] if
4.In some binary systems， astronomers have shown that there is an invisible companion star， a 'partner' to____which we can see in the sky.
[A] the one
[B] that
[C] the ones
[D] those
5.On the other hand， scientists have suggested that very advanced technology could one day____the energy of black holes for mankind.
[A] make fun of
[B] make sure of
[C] make use of
[D] make sense of
6.Astronomers have evidence of a few other stars too， which might have black holes as____.
[A] companies
[B] comparisons
[C] compounds
[D] companions
7.The earth is one of nine planets which move in____round the sun.
[A] track
[B] orbit
[C] tour
[D] route
8.In August 1977， a satellite was____to gather data about the black holes in the Milky way.
[A] posted
[B] delivered
[C] launched
[D] transmitted
9.The terms we would normally use to describe a scientific phenomenon are____here.
[A] inadequate
[B] invisible
[C] intense
[D] individual
10.We know nothing about events which happen once objects pass this boundary， But____，matter must behave very differently inside the hole.
[A] in addition
[B] in person
[C] in detail
[D] in theory
ⅣC-E Translation
1.这个收缩的过程如此强烈，以至于黑洞产生了。
2.直到最近天文学家们才开始研究黑洞。
3.但是从理论上说，物质在黑洞里的行为一定非常不同。
4.黑洞最强有力的证据来自对双星系的研究。
5.有一天也许人类也会遭此命运。
单元自测答案 Unit 2
Ⅰ Word Spelling
1.density 2.collapse 3.boundary
4.constant 5.basis 6.launch
7.twin 8.companion 9.mankind
10.speculation 11.swallow 12.inadequate
13.matter 14.circumstance 15.occur
16.intense 17.evidence 18.invisible
19.astronaut 20.tropical
Ⅱ Word Form
1.were reported 2.having 3.made
4.believed 5.is being pulled 6.swallowing
7.convincing 8.totally 9.consists
10.coloured
ⅢVocabulary and Structure
1.B 2.D 3.A 4.A 5.C
6.D 7.B 8.C 9.A 10.D
ⅣC-E Translation
1.This process of shrinking is so intense that a black hole results.
2.It is only recently/It is not until recently that astronomers have begun specific research into black holes.
3.But in theory， matter must behave very differently/in a very different manner inside the black hole.
4.The most convincing evidence of black holes comes from research into binary star systems.
5.Mankind may one day meet this fate. |
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