2017職稱英語《理工C》試題：閱讀理解專項練習(xí)(2)

　　Sunspots (太陽黑子)

　　It's not surprising that sunspots were observed by ancient astronomers (天文學(xué)家) . The largest sunspots on the sun can be seen without a telescope. It was not until the invention of the telescope (望遠(yuǎn)鏡) in the early 17th century, however, that systematic studies of sunspots could be undertaken. The great astronomer Galileo was among the first to make telescopic observations of sunspots.

　　Sunspots are regions of extremely strong magnetic fields (磁場) found on the sun's surface. A sunspot has a dark central core known as the umbra. The umbra is surrounded by a dark ring called the penumbra, where the magnetic field spreads outward. Sunspots appear dark because they are giving off less radiation. They are cooler than the rest of the sun's surface.

　　Sunspots are frequently observed in pairs or in paired groups. The members of a spot pair are identified as the leading spot and the following spot. They are identified by their position in the pair in terms of the direction in which the sun rotates (旋轉(zhuǎn)) .

　　The number of sunspots at any one time varies. A large spot group may consist of as many as 10 groups and 300 spots across the sun. The number of spots changes in a fairly regular pattern called the sunspot cycle. The largest number occurs about every 11 years. At sunspot minimum,there are at most just a few small spots.

　　The average lifetime of an individual spot group is roughly one solar rotation, which is about25 days. The most persistent large spots, however, can survive for two to three months.

　　1.Careful observations and systematic studies of sunspots __________.

　　A. were made by ancient astronomers

　　B. started in the early 17th century

　　C. were made by Galileo only

　　D. could be made without a telescope

　　2.Sunspots are cooler than the rest of the sun's surface because __________.

　　A. they produce less energy

　　B. they are buried in the sun

　　C. they are far away from magnetic fields

　　D. they are close to magnetic fields.

　　3.The leading spot and the following spot are the names of __________.

　　A. two large sunspots

　　B. a large spot and a small spot

　　C. the two spots in a spot pair

　　D. the central core and the ring around it

　　4.If an intense sunspot activity had occurred in 1857, the next one would have been in __________.

　　A.1858

　　B.1862

　　C.1865

　　D.1868

　　5.In the last paragraph the word "persistent' means __________.

　　A. important

　　B. effective

　　C. enduring

　　D. visible

　　2017年職稱英語試題《理工C》閱讀理解專項練習(xí)題解析

　　1.B。細(xì)節(jié)題。題干：對太陽黑子的仔細(xì)觀察和系統(tǒng)研究__________。利用題干關(guān)鍵詞可以定位到第一段的第三句話，該句提到，直到17世紀(jì)早期發(fā)明了望遠(yuǎn)鏡，對太陽黑子的系統(tǒng)研究才得以進(jìn)行。所以和原文內(nèi)容符合的只有B。

　　2.A。細(xì)節(jié)題。題干：太陽黑子要比太陽表面溫度低是因為__________。利用題干關(guān)鍵詞可以定位到第二段，這段的最后兩句提到，由于黑子發(fā)出的光和熱相對較少，它們顏色更暗，也比太陽表面的其他部分溫度低。所以A是正確答案。

　　3.C。細(xì)節(jié)題。題干：主導(dǎo)地位的黑子和從屬地位的黑子指的是__________。利用題干關(guān)鍵詞可以定位到文章第三段的前兩句，該處提到，我們觀測到的太陽黑子總是成對出現(xiàn)。成對出現(xiàn)的兩黑子被區(qū)分為主導(dǎo)地位的黑子和從屬地位的黑子。所以答案為C，主導(dǎo)地位與從屬地位的黑子是用來區(qū)分成對出現(xiàn)的黑子的。

　　4.D。推理題。題干：如果上一次劇烈的黑子運(yùn)動發(fā)生在1857年，那么下一次就會發(fā)生在。利用題干關(guān)鍵詞可以定位到本文第四段的第四句話，由該句可知太陽黑子的劇烈活動每11年爆發(fā)一次，因此如果上一次發(fā)生在1857年，那么下一次就會發(fā)生在1868年。

　　5.C。詞匯題。題干：最后一段中的“persistent”的意思是__________。利用題干關(guān)鍵詞可以定位到本文最后一段，由該段可知黑子群的存在時間平均為25天，最穩(wěn)定的大的黑子群能存在兩至三個月。將兩句話當(dāng)中的時間加以對比，可以推斷persistent的意思是“長久的”，所以答案為C。