第6部分：完形填空（第51～65题，每题1分，共1 5分）

阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。

Dark Forces Dominate Universe

The earth, moon, sun and all visible stars in the sky make up less than one percent of the universe. Almost all the rest is dark matter and dark energy, unknown forces that （51） astronomers．

Observations in recent years have changed the basic（52）of how the universe evolved and have indicated how little is known about the major forces and substances that  （53） our world.

Astronomers now know that luminous（发光的）matter-stars，planets and hot gas —— Accounts  （54） only about 0,4 percent of the universe. Non-luminous components, such as black holes and intergalactic（星系间的）gas,  （55）up 3.6 percent The rest is either dark matter, about 23 percent, or dark energy, about 73 percent.

Dark matter, Sometimes （56）" cold dark matter, has been known for some time. Only recently have researchers come to understand the key role it  （57）formation of stars, planets and even people.

"We （58） our very existence to dark matter," said physicist Paul Steinhardt and a co-author of a review on dark matter which  （59）not long ago in the journal Science．

"Dark matter dominated the structure（60）in the early universe," Steinhardt said．''For the first few billion years dark matter contained most of the mass of the universe You can think of ordinary matter   （61） a froth（泡沫）of an ocean of dark matter．The dark matter dumps（结成块）and the ordinary matter falls into it．That  （62） to the formation of the stars and galaxies（星系）．"

Without dark matter, "there would be virtually no structures in the universe."

The nature of dark matter is   （63）It cannot be seen or detected directly astronomers know it is there because of its  （64）on celestial（天体的）objects that can be seen and measured．

But the most dominating force of all in the universe is called dark energy, a recently （65）power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed.

51 A worry          B move     C puzzle    D reject

52 A understanding   B value     C pattern     D structure

53 A changed        B described  C designed  D shaped

54 A in             B for       C of        D to

55 A make          B keep      C set       D get

56 A written         B called     C identified  D seen

57 A signed          B stressed   C acted     D played

58 A believe         B owe       C feel      D regard

59 A appeared        B carried    C published   D contributed

60 A element        B shape     C formation   D power

61 A with          B as          C form      D beside

62A turned         B worked    C led         D attempted

63 A unknow       B interesting   C different   D visible

64 A form          B outcome   C effect      D source

65 A seized         B proven    C caught      D grasped

答案:
51 C puzzle：使……感到迷惑。几个选项中只有此选项意思符合原文。

52 A  此句的意思是近年来的观察改变了人们对于宇宙是如何演变的基本了解。其他几个选项与原文不符。

53 D  此处应该是形成世界的各种物质。故用D.

54 B  account for意思是占……比例，属固定搭配。

55 A  make up 也是一词组，表示"组成，构成；占……"的意思。

56 B dark matter又称为cold dark matter，此处只有called合适，其他几个选项意思不符。

57 D play a role in是一固定词组，意思是"在……发挥作用".其他几个选项不合适。

58 B  owe t0也是一固定搭配，意思是"认为是靠……的力量"，此句的意思是"我们靠暗物质的力量而存在".

59 A  从上下文来讲，选项A最合适，与文意相符。

60 C  此处的意思是"暗物质在宇宙早期结构形成过程中起着主导作用".四个选项中只有c与文意符合。

61 B  此题应从结构方面考虑。think…as…：把……视为……

62 C　lead to是一固定词组，意思是"导致……".

63 A  从整个段落意思来考虑，只有选项A合适。

64 c  此题亦需从上下文来考虑，effect指影响，只有此选项符合文意。

65 B  暗物质是被科学家们证明存在的一个能量。这种能量正影响着整个宇宙。被证明的：proven.其他几个选项与文意不符。