1 . While many of us might long to just sleep through this entire winter, humans, unlike a lot of other mammals - don’t have the capacity to hibernate (冬眠). But researchers think they have found some tell-tale marks on the fossils, which suggests that early humans may have survived the harsh winter by hibernating.
Bears have specialized metabolic (新陈代谢的) processes to protect them from this extended sleep, but sometimes this process doesn’t quite go to plan. For example, hibernators can end up with a host of diseases after hibernation if they don’t get enough food reserves before they go down for the winter. The researchers believe this may have been the circumstance of some human ancestors whose remains with deep cracks in bones were discovered in a Spanish cave called Sima de los Huesos. This deep hole is home to an incredible number of fossils, with archaeologists having discovered thousands of early humans’ skeletal remains that are around 430,000 years old and probably the ancestors of the Sima people or others.
In a paper published in L’Anthropologie, two experts argue that the fossils found in Sima de los Huesos show seasonal variations that suggest that bone growth got interrupted for several months of each year. They suggest these early humans found themselves being in metabolic states that helped them to survive for long periods of time in extremely cold conditions with limited stores of body fat.
The researchers admit the idea “may sound like science fiction”, but they point out that many mammals including primates (灵长类动物) do this. “This suggests that the genetic basis and physiology for such slow metabolism could be preserved in many mammalian species including humans," state Arsuaga and Bartsiokas.
However, Chris Stringer of the Natural History Museum in London pointed out that large mammals such as bears do not actually hibernate, because their large bodies cannot lower their core temperature enough. Instead, they enter a less deep sleep known as torpor. In such a condition, the energy demands of the human-sized brains of the Sima people would have remained very large, creating an additional survival problem for them during torpor.
1. Why does the author mention the example in Paragraph 2?| A．To explain the special ability of bears. | B．To provide the background to the research. |
| C．To show the basis of researchers’ evaluation. | D．To discuss a new cause of hibernating disease. |
| A．They were badly preserved with deep cracks. |
| B．Their growth discontinued temporarily for some reason. |
| C．Their appearances varied from individual to individual. |
| D．They showed signs of people living in comfort in the past. |
| A．It’s quite possible. | B．It merely appears in science fiction. |
| C．It’s an exception to human genetics. | D．It solved the mystery of humans’ evolution in Europe. |
| A．They might have developed smaller brains. |
| B．Their daily sleep quality might become poor. |
| C．Their body temperature might increase rapidly. |
| D．They might suffer from life-threatening starvation. |
1. What made the white T-shirts popular?
| A．A fashion show. | B．Hollywood movies. | C．The American soldiers. |
| A．In 1948. | B．In 1959. | C．In 1970. |
| A．For a black leader. | B．For a fashion designer. | C．For an American actress. |
3 . More than 3,400 years after two ancient Egyptians were laid to rest, the jars of food left still smell sweet. A team of analytical chemists and archaeologists (考古学家) has analysed these smells to help identify the jars’ contents. The study shows how the exploration of smell can enrich our understanding of the past.
The 1906 discovery of the undisturbed tomb (墓穴) of Kha and Merit symbolized an important stage in Egyptology. The tomb remains the most complete non-royal ancient one ever found in Egypt, showing important information about how high-ranking individuals were treated after death.
Unusually for the time, the archaeologist who discovered the tomb resisted the temptation to open the sealed containers even after they were sent to the Egyptian Museum. The contents of many of these containers are still unknown, although there are some clues, says analytical chemist Ilaria Degano. “From taking with the museum keeper we knew there were some fruity smells in the display cases,” she says.
Degano and her colleagues placed various artefacts (人工制品) inside plastic bags for several days to collect some of the chemical substances they released. Then the team used a special machine to identify the components of the smells from each artefact. They found some chemicals associated with dried fish, and some chemicals common in fruits. The findings will feed into a larger project to reanalyse the tomb’s contents and produce a more comprehensive picture of burial customs for non-royals that existed when Kha and Merit died, about 70 years before Tutankhamun became the Egyptian ruler.
Aside from showing more about past civilizations, ancient smells could make museum visits more inviting. Usually, people admire exhibits with their eyes in museums. “Smell is a relatively unexplored gateway to the collective past for museum visitors,” says Cecilia Bembibre at University College London. “It has the potent alto allow us to experience the in a more emotional, personal way, through our nose.”
1. What can we describe the 1906 discovery of Kha and Merit’ tomb as?| A．A landmark in Egyptology. | B．A turning point in human history. |
| C．A breakthrough in archaeology. | D．A mirror of ancient non-royal life. |
| A．Pressure. | B．Ambition. | C．Desire. | D．Tendency. |
| A．protect them from harm | B．gather their smells |
| C．test the special machine | D．back up a larger project |
| A．They bring them back to the past. |
| B．They give them emotional support. |
| C．They change their view on civilizations. |
| D．They add to their experience. |
4 . Humans evolved from apes. This is what we learned in biology class. But what came before apes? Chinese scientists have discovered fossils that could enrich the evolutionary story of how humans evolved from fish.
According to four articles published in the journal Nature in late September, Chinese researchers found fish fossils that provide the “missing link” about the origin of the jaw, a key feature that 99.8 percent of vertebrate (脊椎动物) species have.
Zhu Min, a lead researcher of the studies from the Chinese Academy of Sciences, said that the findings drew a large amount of interest in the science world due to the importance of jaws in animal evolution.
However, the rise of the jaw had been a mystery due to a lack of sufficient fossil evidence to support that jawed vertebrates lived 450 million years ago.
The latest findings made by Zhu’s team presented a set of five surprisingly well-preserved fish fossils that included three whole-bodied fish, helping scientists paint a more accurate evolutionary picture of the origin of the jaw. The fish fossils were discovered at two sites in Chongqing and Guizhou, whose strata (岩层) date back to the Silurian Period that began around 440 million years ago.
These fossils show that jawed fish were already thriving (繁荣) in the world’s ancient oceans at that time. Later on, more diverse and larger jawed fish evolved and began to spread around the world, paving the way for some fish to eventually go on land and evolve into other animals — including humans.
“These fossils provide an unprecedented (前所未有的) opportunity to peek into the ‘dawn of fish’ and help scientists trace many human body structures back to these ancient fish thus filling some key gaps in the evolutionary history of how fish evolved into humans,” Zhu said.
1. In which column of a magazine will you most probably read the passage?| A．Your Voice. | B．Animals. |
| C．Science Study. | D．History. |
| A．Because jaws are a key trait of all vertebrate species. |
| B．Because jaws are significant in animal evolution. |
| C．Because the rise of the jaw had been a mystery. |
| D．Because there is a lack of sufficient evidence. |
| A．Around 440 million years ago. |
| B．Around 450 million years ago. |
| C．When jawed fish began to spread around the world. |
| D．When fish evolved into humans. |
| A．Who Are Our Ancestors? | B．What Came Before Apes? |
| C．The Origin of the Jaw | D．Key Gaps in Evolution |
5 . A team of divers has recently discovered what’s believed to be the longest underwater cave in the world, just three miles from the white sand beaches of the Mexican resort (度假胜地) of Tulum.
The findings confirm that the huge 164-mile-long Sac Actun system is connected to the 53-mile-long Dos Ojos system, bringing the total length of the caves to amazing 216 miles. Some of the caves have a depth of more than 332 feet.
With more than 200 caves, they thought there was chance that something record-breaking would be found below the surface-they just had no proof-until now. Divers have long known that Tulum’s underground caves and rivers are frequently connected, but finding this connection was a task that involved years of searching through labyrinthine (复杂的) passageways.
More exciting than the amazing underwater photographs coming out of the caves is the possibility of uncovering the secrets of the Maya civilization, which ruled this region before the 16th century.
“The area also has lots of historical treasures,” said underwater archaeologist and project director Guillermo de Anda. “Parts of the region were inhabited by the ancient Maya civilization before the Spanish conquest in the 16th century. The discovery will help us better understand the rich culture in the region.”
The combined cave will be known as the Sac Actun system. But while its size makes it the longest underwater cave, it can’t take the title of the longest cave. That belongs to the Mammoth Cave in the American hillsides of Kentucky-thought to be near double the length. They’ll need to keep diving to beat that one.
1. What discovery have the divers recently made?| A．There are more than 200 caves in the area. |
| B．Some of the caves have a depth of more than 332 feet. |
| C．There is something record-breaking below the surface. |
| D．The Sac Actun system is connected to the Dos Ojos system. |
| A．They might discover more caves in the area. |
| B．They might find some unique animals in the caves. |
| C．It might help them better understand the area’s history. |
| D．It might greatly contribute to the tourism in the area. |
| A．52 miles. | B．164 miles. | C．216miles. | D．Over 400 miles. |
| A．A book review. | B．A science report. | C．A history textbook. | D．A tour guide. |
6 . An individual from an unknown hominid (原始人类) species walked across a field of wet, volcanic ash in what is now East Africa around 3.66 million years ago, leaving behind a handful of footprints.
Those five ancient footprints, largely ignored since they were partly unearthed at Tanzania’s Laetoli site in 1976, show features of upright walking by a hominid, a new study finds. Researchers had previously considered them hard to classify, possibly produced by a young bear that took a few steps while standing. But the latest analysis refutes that suggestion.
McNutt, DeSilva, who started the new investigation as a Dartmouth College graduate student, and their colleagues fully dug out and cleaned the five Laetoli footprints in June 2019. Then they measured, photographed and 3-D scanned the ancient tracks. McNutt’s group focused on two footprints that were particularly well-preserved. Foot shapes, sizes, and walking characteristics of the Laetoli individual differed in various ways from those of other hominid individuals at the same site. The prints also didn’t match those from modern black bears and modern chimps (黑猩猩) walking upright.
The Laetoli individual possessed a wider, more chimplike foot than humans, the researchers say. Its big toe stuck out slightly from the second toe (脚趾), but not to the degree observed in chimps. On one step, the Laetoli individual’s left leg crossed in front of the right leg, leaving a left footprint directly in front of the previous track. People may cross-step in this way when trying to regain balance. And bears and chimps assume a relatively wide standing due to knee and other bone arrangements that prevent them from walking like the Laetoli individual and probably from cross-stepping, the scientists say.
Given that only two of the ancient footprints are complete enough to analyze thoroughly, the possibility that a chimp other than a hominid made the Laetoli footprints can’t be ruled out, says William Harcourt Smith, a scientist at Lehman College. But evidence of cross-stepping is enough to prove that it was a hominid track maker, he says.
1. What does the underlined word “refutes” in Paragraph 2 mean?| A．Objects to. | B．Supports. | C．Puts forward. | D．Criticizes. |
| A．They are less chimplike. | B．They have toes sticking out. |
| C．They show relatively wide standing. | D．They possess features of cross-stepping. |
| A．It’s convincing. | B．It’s challenging. |
| C．It’s confusing. | D．It’s conflicting. |
| A．To describe a major event. | B．To share a new discovery. |
| C．To introduce an unknown species. | D．To settle a huge disagreement. |
