【文章內(nèi)容簡介】 Scientists have discovered a monster black hole so massive that, in theory, it shouldn39。t exist. It39。s a stellar black hole—the type that forms after stars die, collapse, and explode. Researchers had previously believed that the size limit was no more than 20 times the mass of our sun because 8S these stars die, they lose most of their mass through explosions that expel matter and gas swept away by stellar winds This theory has now been toppled by LB1, the newly discovered black hole. Located about light years away, it has a mass 70 times greater than our sun, according to a press release from the Chinese Academy of Sciences. The findings were published by Chinese researchers in the journal Nature on Wednesday. Black boles of such mass should not even exist in our galaxy, according to most of the current models of stellar evolution, said Liu Jifeng, head of the team that made the discovery. LB1 is twice as massive as what we thought possible. Now theorists will have to take up the challenge of explaining its formation. Scientists are now scratching their heads at how LB1 got so huge. The Chinese team has proposed a number of theories. LB139。 sheer size suggests that it was not formed from the collapse of only one star, the study said— instead, it could potentially be two smaller black holes orbiting each other. Another possibility is that it formed from fallback supermova. This is when a supernoma—the last stage of an exploding star—ejects material during the explosion, which then falls back into the supernova, creating a black hole. This fallback formation is theoretically possible but scientists have never been able to prove or observe it. If this is how LB1 formed, then we may have direct evidence for this process for the first time, the study said. There are several types of black holes and stellar black holes like LB1 are on the smaller side, according to NASA. Supermassive black holes are much bigger—they can be billions of times the mass of our sun, Scientists believe supermassive black holes may be connected to the formation of galaxies, as they often exist at the center of the mass star stems but it is still not clear exactly how, or which form first.（1）Why does the writer write the article? report the great achievement Chinese scientists have made in black hole theory, inform the readers of the basic knowledge about the black hole, share with the readers the new development of the black hole discovery, demonstrate the significance of discovering new black holes for science.（2）Which of the following about LB1 is true to the passage? is the biggest black hole ever discovered. lost only a small part of its mass through explosion. couldn39。t have been formed from the collapse of one star. discovery may lead to some breakthrough in the fallback formation theory.（3）Which of the following is right according to the passage? the sun in our galaxy dies some of its mass will be taken away by stellar winds. massive supernova will be formed and then exploded if the sun in our galaxy dies.C.The Milky Way was formed after a supermassive black hole collapsed and exploded. the Milky Way dies, a supermassive black hole will be formed after its death.【答案】 （1）C（2）D（3）A 【解析】【分析】本文是一篇新聞報道，報道了科學(xué)家們已經(jīng)發(fā)現(xiàn)了一個“巨型黑洞”，其質(zhì)量之大，在理論上是不應(yīng)該存在。但這個理論現(xiàn)在已經(jīng)被新中國科學(xué)家發(fā)現(xiàn)的黑洞LB1所推翻?？茖W(xué)家們現(xiàn)在正絞盡腦汁研究LB1是如何變得如此巨大的，并介紹了幾種可能性的理論。 （1）考查推理判斷。根據(jù)第一段中的“Scientists have discovered a ‘monster black hole’ so massive that, in theory, it shouldn39。t exist.”可知，科學(xué)家們已經(jīng)發(fā)現(xiàn)了一個“巨型黑洞”，其質(zhì)量之大，在理論上是不應(yīng)該存在；再根據(jù)第三段“This theory has now been toppled by LB1, the newly discovered black hole. Located about light years away, it has a mass 70 times greater than our sun, according to a press release from the Chinese Academy of Sciences.”可知，但這個理論現(xiàn)在已經(jīng)被新中國科學(xué)家發(fā)現(xiàn)的黑洞LB1所推翻。根據(jù)中國科學(xué)院的一份新聞稿，它位于15000光年之外，質(zhì)量是太陽的70倍。所以判斷出作者寫這篇文章的目的是與讀者分享黑洞發(fā)現(xiàn)的新進展，故選C。 （2）考查細節(jié)理解。根據(jù)倒數(shù)第三段中的“If this is how LB1 formed, then we may have‘direct evidence for this process’ for the first time.”可知，如果這就是LB1的形成過程，那么我們可能首次有了“這一過程的直接證據(jù)”。所以LB1這一發(fā)現(xiàn)可能會給“后援形成理論”帶來一些突破。故選D。 （3）考查細節(jié)理解。根據(jù)第二段中的“because 8S these stars die, they lose most of their mass through explosions that expel matter and gas swept away by stellar winds.”可知，因為這些恒星會死亡，它們大部分質(zhì)量因爆炸而損失，恒星風(fēng)會把爆炸釋放出來的物質(zhì)和氣體吹走。所以如果我們星系中的太陽死亡，它的一部分質(zhì)量會被恒星風(fēng)吹走。故選A。 【點評】本題考點涉及細節(jié)理解和推理判斷兩個題型的考查，是一篇新聞報道，考生需要準(zhǔn)確掌握細節(jié)信息，并根據(jù)上下文進行邏輯推理，從而選出正確答案。5．閱讀理解 Two young giantpanda twins born in the United States have returned home to China, but are straggling to adapt to the language and food. The 3yearold sisters, Mei Lun and Mei Huan, wens the first surviving panda twins to be born in the United States, and were returned to China from Zoo Atlanta on Nov. 5. But the pair still understand English belter than Chinese, and prefer American biscuits to Chinese bread. A zookeeper said that his main concern is that the pair are so addicted to American biscuits that everything they eat — from bamboos to apples — has to be mixed with biscuits. They even want to snack on (零食) biscuits when drinking water. The zoo keeper is trying to wean them off their biscuit habit, gradually replacing the American food with Chinese bread. Mei Huan is adapting, but Mei Lun doesn39。t want to touch the unfamiliar bread. Mei Lun is the livelier of the two, often jumping onto the roof and hanging upside down from a rail, but her slightly younger sister Mei Huan is calmer, preferring to sit still, observe her new environment and occasionally snack on bamboo. A language barrier is also reported. While the pair respond to their own names, and understand some English phrases such as “e here,” they don39。t understand the Sichuan dialect of Chinese. The news caused some laughter on Chinese social media, with some users menting that the pandas would soon get used to Sichuan39。s famously spicy cuisine.（1）Based on the passage, which statement do you think is right? A.The panda twins can fit in well in Sichuan.B.The panda twins are only fond of Sichuan food and dishes.C.The panda twins have been used to the new environment very quickly.D.It39。s hard for the panda twins to get used to the new environment soon.（2）What does the underlined part “wean the