2012年職稱英語(yǔ)考試試題考前模擬訓(xùn)練4
Black holes
Most scientists agree that black holes exist but are nearly impossible to locate. A black hole in the universe is not a solid object，like a planet ，but it is shaped like a sphere（球體）。 Astronomers（天文學(xué)家） think that at the center of a black hole there is a single point in space with infinite（無(wú)限的） density（稠密）。 This single point is called a singularity（奇點(diǎn)）。 If the singularity theory is correct ，it means that when a massive star collapses，all the material in it disappears into the singularity. The center of a black hole would not really be a hole at all， but an infinitely dense point. Anything that crosses the black hole is pulled in by its great gravity.
Although black holes do exist， they are difficult to observe. These are the reasons.
No light or anything else comes out of back holes. As a result，they are invisible to a telescope.
In astronomical terms， black holes are truly tiny. For example， a black hole formed by the collapse of a giant star would have an event horizon（視界） only 18 miles across.
The nearest black holes would be dozens of light years away from Earth. One light year is about 6 trillion（萬(wàn)億） miles. Even the most powerful telescopes could not pick out an object so small at such a great distance.
In 1994 the Hubble Space Telescope provided evidence that black holes exist. There are still answers to be found， however， so black holes remain one of the mysteries of the mysteries of the universe.
16 Black holes are part of space.
A Right
B Wrong
C No mentioned
17 Black holes exist but are difficult to observe.
A Right
B Wrong
C No mentioned
18 The center of a black holes is empty.
A Right
B Wrong
C No mentioned
19 The attraction of two large stars leads to gravity.
A Right
B Wrong
C No mentioned
20 The sun is the heaviest star in the universe.
A Right
B Wrong
C No mentioned
21 The nearest black holes are hundreds of light years away from us.
A Right
B Wrong
C No mentioned
22 The Hubble Space Telescope helps scientists to understand the nature of the universe.
A Right
B Wrong
C No mentioned
參考答案：A A B C C B A
答案解析：
16 A 第一段第二行首句a black hole in the universe？？？指明本題答案。本題中space 不是空間，而是宇宙、太空的意思 ，跟課文中universe同義。
17 A 答案在第二段第一句話里：Although black holes do exist， they are difficult to observe。
18 B 這個(gè)陳述是錯(cuò)誤的。第一段第三行的句子astronomers think that at the center of a black hole there is a single point in space with infinite density。天文學(xué)家認(rèn)為黑洞中心有個(gè)密度無(wú)限大的點(diǎn)，所以黑洞并不是空的。
19 C 關(guān)于gravity（重力）是怎么形成的，文章中沒(méi)有提到。
20 C 這個(gè)問(wèn)題——太陽(yáng)是宇宙中重的星球——文章中也沒(méi)有提到。
21 B 第二段給出的第三個(gè)原因the nearest black holes would be dozens of light years away from Earth表明離我們近的黑洞有dozens of（許多，好幾打）而不是hundreds of（成百上千的）光年，所以本題描述錯(cuò)誤。
22 A 后一段第一句告訴我們Hubble Space Telescope provided evidence that black holes exist哈勃望遠(yuǎn)鏡提供了黑洞存在的證據(jù)，正是通過(guò)這種方式，哈勃望遠(yuǎn)鏡幫助科學(xué)家們更好地了解了宇宙的本質(zhì)。因此該陳述正確。
Black holes
Most scientists agree that black holes exist but are nearly impossible to locate. A black hole in the universe is not a solid object，like a planet ，but it is shaped like a sphere（球體）。 Astronomers（天文學(xué)家） think that at the center of a black hole there is a single point in space with infinite（無(wú)限的） density（稠密）。 This single point is called a singularity（奇點(diǎn)）。 If the singularity theory is correct ，it means that when a massive star collapses，all the material in it disappears into the singularity. The center of a black hole would not really be a hole at all， but an infinitely dense point. Anything that crosses the black hole is pulled in by its great gravity.
Although black holes do exist， they are difficult to observe. These are the reasons.
No light or anything else comes out of back holes. As a result，they are invisible to a telescope.
In astronomical terms， black holes are truly tiny. For example， a black hole formed by the collapse of a giant star would have an event horizon（視界） only 18 miles across.
The nearest black holes would be dozens of light years away from Earth. One light year is about 6 trillion（萬(wàn)億） miles. Even the most powerful telescopes could not pick out an object so small at such a great distance.
In 1994 the Hubble Space Telescope provided evidence that black holes exist. There are still answers to be found， however， so black holes remain one of the mysteries of the mysteries of the universe.
16 Black holes are part of space.
A Right
B Wrong
C No mentioned
17 Black holes exist but are difficult to observe.
A Right
B Wrong
C No mentioned
18 The center of a black holes is empty.
A Right
B Wrong
C No mentioned
19 The attraction of two large stars leads to gravity.
A Right
B Wrong
C No mentioned
20 The sun is the heaviest star in the universe.
A Right
B Wrong
C No mentioned
21 The nearest black holes are hundreds of light years away from us.
A Right
B Wrong
C No mentioned
22 The Hubble Space Telescope helps scientists to understand the nature of the universe.
A Right
B Wrong
C No mentioned
參考答案：A A B C C B A
答案解析：
16 A 第一段第二行首句a black hole in the universe？？？指明本題答案。本題中space 不是空間，而是宇宙、太空的意思 ，跟課文中universe同義。
17 A 答案在第二段第一句話里：Although black holes do exist， they are difficult to observe。
18 B 這個(gè)陳述是錯(cuò)誤的。第一段第三行的句子astronomers think that at the center of a black hole there is a single point in space with infinite density。天文學(xué)家認(rèn)為黑洞中心有個(gè)密度無(wú)限大的點(diǎn)，所以黑洞并不是空的。
19 C 關(guān)于gravity（重力）是怎么形成的，文章中沒(méi)有提到。
20 C 這個(gè)問(wèn)題——太陽(yáng)是宇宙中重的星球——文章中也沒(méi)有提到。
21 B 第二段給出的第三個(gè)原因the nearest black holes would be dozens of light years away from Earth表明離我們近的黑洞有dozens of（許多，好幾打）而不是hundreds of（成百上千的）光年，所以本題描述錯(cuò)誤。
22 A 后一段第一句告訴我們Hubble Space Telescope provided evidence that black holes exist哈勃望遠(yuǎn)鏡提供了黑洞存在的證據(jù)，正是通過(guò)這種方式，哈勃望遠(yuǎn)鏡幫助科學(xué)家們更好地了解了宇宙的本質(zhì)。因此該陳述正確。