What is a black hole? Well, it is difficult to answer the question,
7 C( {2 [; I# B- s) a: p as the terms we would normally use to describe a scientific phenomenon __1__
1 D0 {. B' N9 f. c% u are adequate here. Astronomers and scientists think that a black hole is __2__/ P b* B0 m* s' ]
a region of space which matter has fallen and from which nothing can __3__( N9 s2 ?* g& h5 G
escape—not even light. But we can’t see a black hole. A black hole __4__
7 |3 m N; o- _. L6 _! | exerts a strong gravitational pull and yet it has no matter. It is only3 C$ U" q, Y2 \2 Y. d
space—or thus we think. How can this happen? __5__9 X+ v/ Y0 T: T, X
The theory is that some stars explode when their density increases" j( i( b2 L. r$ [, o, o
to a particular point; they “collapse” and sometimes a supernova occurs.# b, o" y1 k. e3 H, i
The collapse of a star may produce a “White Dwarf” of a “neutronstar”—* L+ Q, i. M; O$ R8 J
a star which matter is so dense that if continually shrinks by the force of __6___
- A* k- F7 z: K; ^9 x its own gravity. But if the star is very large, this process of shrinking may- W h: {7 \; q! x
be so intense that a black hole results in. Imagine the earth reduced to the __7__2 V z2 J' ]7 i) S6 `! S2 l' h
size of a marble, but still having the same masses and a stronger __8__! x- `! N% L8 r) o3 F% \+ ]
gravitational pull, and you have some ideas of the force of a black hole. __9__$ d) ~3 U6 t) K5 ?+ L) p
And no matter near the black hole is sucked in. __10__
& ?( D1 d o0 S5 f" y# u/ Q. ` 参考答案及解析:
! u7 L p4 K; L/ D* M supernova 名词,[天]超新星
! G" J+ i1 w6 C$ @/ z 1. 将as 改为since或者because。在表示原因的连接词中,只有as引导的原因状语从句不能位于主句之后,只能位于句首。1 p% B0 k% v& k" G
2 .将adequate 改为inadequate,或者在are后加not。从逻辑上分析,因为我们拥有的科学术语“不充足”,所以才无法回答这个问题,所以用否定形式。- m' V. t( K# h( T& S5 p
3. 在which 前加into。这是一个定语从句,意思是“黑洞是太空中物质可以掉进去的地方”,所以定语从句应该为“into which matter has fallen”。
* B0 c0 S. _7 [ V# X( n: m" a1 { 4. 将but 改为 so。 上文已提到“连光都无法从黑洞中逃出”,所以我们根本无法看到黑洞。这里应该是因果关系,而不是转折关系。# Q3 p+ J8 v: v$ n' f/ ^$ `- D" c
5 .将thus改为so。这句话的意思是“那只是空间—或者我们认为它只是空间”。so做 think 的宾语,thus 只能做连词,不能做宾语。8 {6 B8 z/ M \, t5 W
6. 将which 改为whose。这个定语从句的意思是“它是一颗星,其密度非常大,由于自身的引力,它在不断地收缩”。matter 属于star,所以关系代词应该用whose。
0 I' y) {+ U9 [% p# A% V 7 .去掉in。result为不及物动词,意为“形成了”,而“result in sth。”意为“导致某结果”。. `0 U; Y7 z1 @0 [2 x
8. 将masses 改为mass。mass 可指“大量的物质”,而“the masses”特指“劳动群众”,用在此处不妥。
# I# o6 ?4 W/ ?6 |1 o 9 .将ideas 改为idea。“idea”在表达“印象”时,为不可数名词,不可以用复数。
" Z7 z8 b) |$ d+ @ J6 V6 V- O 10. 将no改为any。分析便知,任何在黑洞附近的东西都会被吸进去。 |