The disappearance of dinosaurs made _______ the evolution and dominance of mammals on the earth.
A. it was possible B. it possible C. possible to be D. possible
高三英语单项填空中等难度题
The disappearance of dinosaurs made _______ the evolution and dominance of mammals on the earth.
A. it was possible B. it possible C. possible to be D. possible
高三英语单项填空中等难度题查看答案及解析
（2017·江苏）The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _______ explanations are hard to find .
A. alternative B. aggressive
C. ambiguous D. apparent
高三英语单项填空困难题查看答案及解析
The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _______ explanations are hard to find.
A.alternative B.aggressive
C.ambiguous D.apparent
高三英语单项填空困难题查看答案及解析
The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _________explanations are hard to find.
A.alternative B.aggressive C.ambiguous D.apparent
高三英语单项填空中等难度题查看答案及解析
完形填空（2） 阅读下面短文，掌握其大意，然后从11~20各题所给的A、B、C和D项中，选出最佳选项，并在答题卷上将该项涂黑。
The theory of evolution was made by Charles Darwin. It has had a great 11 on the world today. It has caused many debates between religious authorities and those from the 12 community. This theory makes people think about their origins. It has changed the way in which they think about themselves in the environment. Charles Darwin collected and provided a lot of information to 13 his theory. His theory and research made him the most popular one in the scientific field of 14 .
Charles Darwin was born in 1809. He was the fourth child in his family. Much of Darwin’s childhood was spent 15 insects and reading books about 16 history. Charles Darwin was not a 17 student during his years at the medical college. He disliked what he was taught. But he 18 an interest in studying rocks and fossils.
Later, he had a chance to travel as a naturalist. It was this chance that made him begin his work on evolution. After a few years’ hard study, he wrote a book called The 19 of Species. In this book, Darwin explained his 20 about “natural selection” and “struggle for existence” .
11. A. effort B. effect C. affect D. affection
12. A. scientific B. social C. abstract D. material
13. A. imagine B. picture C. prove D. discuss
14. A. heredity B. physics C. chemistry D. evolution
15. A. raising B. collecting C. planting D. watching
16. A. natural B. human C. literature D. universal
17. A. naughty B. popular C. incommunicative D. good-tempered
18. A. found B. realized C. developed D. announced
19. A. Origin B. Beginning C. End D. Result
20. A. ways B. ideas C. opinions D. theory
高三英语完型填空简单题查看答案及解析
A huge cloud of dust rose and an overpass disappeared. This was the scene in Zhuzhou，Hunan Province on May 17.Nine people were killed and 16 injured.
Things were similar last year in the Sichuan earthquake. Thousands of people were buried in the ruins and lost their lives. What if we could have warned them?
People are always racking their brains to find a way of preventing buildings’ collapse. Better materials and technology help，but they are not a solution.
Just like humans，a building has its own life cycle from “birth” to “death”．If we know when a building is going to collapse，we can repair it in advance or get out of it before it falls.
Now，scientists at the University of Illinois have developed a material that turns red before it breaks. The invention could be used in things like climbing ropes or bridge supports.
The research was led by Nancy Sottos，a professor at the university’s Beckman Institute，and Douglas Davis，a graduate research assistant.
The secret behind the colorchanging material is a type of molecule (分子)．A molecule is a group of atoms held together by chemical bonds. Imagine you and your friends standing in a circle，holding hands. Each person stands for one atom，your hands represent the bonds，and the entire circle represents a molecule. If one person lets go of his or her hands，the molecule changes color.
The research team put the molecule into a soft material. When the researchers stretched the material，it turned bright red for a few seconds before it broke into two pieces. When they repeatedly stretched and relaxed the material，without breaking it，it only turned a little red.
The major problem is that light can get rid of the red color. When the team shone bright light on the molecule，the broken bond was fixed，and the color disappeared.
If the bright light keeps the red color from appearing，the material’s warning system will be useless. Scientists still have a lot of work to do before the colorchanging molecules can be used outside the lab.
1.What does the passage mainly introduce?
A．The collapse of an overpass in Zhuzhou，Hunan Province.
B．The Sichuan earthquake
C．A material that turns red before it breaks.
D．A way of preventing building from collapsing.
2.The underlined words “racking their brains” in the third paragraph mean ________.
A．suffering a lot B．collecting beyond imagination
C．losing a lot D．thinking very hard
3.Which of the following is a WRONG statement?
A．Thousands of people died from the collapse of buildings in the Sichuan earthquake because they hadn’t been warned.
B．There is no building that will never collapse.
C．A new material has been applied to buildings to warn people of collapse.
D．A colorchanging material can turn red before it breaks.
4.What can we infer from the passage?
A．The colorchanging molecules are certain to be used outside the lab.
B．There will be no collapse with the help of the colorchanging material.
C．There is a long way to go before the material can be applied.
D．The problem caused by bright light will be solved by scientists.
高三英语阅读理解中等难度题查看答案及解析
Sixty-five million years ago, an asteroid (小行星) that crashed on Earth led to the disappearance of the largest animals that have ever walked our planet – the dinosaurs. At least, this is what some scientists believe. But that accident happened so long ago. People have come to believe that we are free of threats from asteroids and everything else from space.
However, what happened on Feb 15 , 2013 was a reminder that we’re just as vulnerable as the dinosaurs once were. Two objects from space – a meteor (陨石) and an asteroid called 2012 DA14 – visited Earth’s atmosphere on the same day. The former fell in Russia, injuring 1,200 people, while the latter passed by Earth at a record-setting close distance.
Scientists had been expecting the asteroid since last year, but the meteor was a surprise. NASA’s telescope system only detects asteroids at least 50 meters in diameter (直径), which is just about the size of 2012 DA14. But the meteor was much smaller, which made it harder to spot.
But what if we do spot an asteroid that is headed right for Earth? There are several possible ways in which dangerous asteroids could be made to change its orbit. Which method is best depends on several factors and most importantly – how much time we have to stop it.
If there is enough time before the hit, we can send off a heavy spacecraft to travel alongside the asteroid. The gravity from the spacecraft would gradually change the rock’s orbit. Besides that, scientists could one day use sun-powered lasers to either make asteroids disappear or change their course. If there’s not enough time, we’ll have to go after the asteroid with a spacecraft and change its orbit with a crash. Finally, if things are truly desperate, there will be only one choice left – to use a nuclear bomb. That could turn the asteroid into a meteor shower, which would be even more dangerous.
1.The author mentioned the asteroid that led to the dinosaurs’ dying out to ______.
A. show that asteroids fall from space frequently
B. alert people about the possible danger of objects falling from space
C. inform readers about the constant threats the Earth faces
D. suggest that there are still many mysteries about the universe
2.The underlined word “vulnerable” in the second paragraph probably means ______.
A. unprotected B. lonely C. stupid D. self-important
3.Which of the following statements is TRUE about the meteor that fell to the Earth in Russia?
A. It passed by the Earth at a close distance.
B. It was spotted by NASA’s telescope system a year ago.
C. It is about the same size as the asteroid that passed by the Earth.
D. It fell to the Earth and caused great damage to the local community.
4.What is the main idea of the article?
A. Learning about asteroids and meteors.
B. The threats of objects from space and possible solutions.
C. NASA’s latest technology to discover visitors to the Earth from space.
D. How to measure the damage of collisions from asteroids and meteors.
高三英语阅读理解中等难度题查看答案及解析
We are the products of evolution, and not just evolution that occurred billions of years ago. As scientists look deeper into our genes (基因), they are finding examples of human evolution in just the past few thousand years. People in Ethiopian highlands have adapted to living at high altitudes. Cattle -raising people in East Africa and northern Europe have gained a mutation (突变) that helps them digest milk as adults.
On Thursday in an article published in Cell, a team of researchers reported a new kind of adaptation - not to air or to food, but to the ocean. A group of sea-dwelling people in Southeast Asia have evolved into better divers. The Bajau, as these people are known, number in the hundreds of thousands in Indonesia, Malaysia and the Philippines. They have traditionally lived on houseboats; in recent times, they’ve also built houses on stilts (支柱) in coastal waters. “They are simply a stranger to the land,” said Redney C. Jubilado, a University of Hawaii researcher who studies the Bajau.
Dr. Jubilado first met the Bajau while growing up on Samal Island in the Philippines. They made a living as divers, spearfishing or harvesting shellfish. “We were so amazed that they could stay underwater much longer than us local islanders,” Dr. Jubilado said. “I could see them actually walking under the sea.”
In2015, Melissa Ilardo, then a graduate student in genetics at the University of Copenhagen, heard about the Bajau. She wondered if centuries of diving could have led to the evolution of physical characteristics that made the task easier for them. “it seemed like the perfect chance for natural selection to act on a population,” said Dr. Ilardo. She also said there were likely a number of other genes that help the Bajau dive.
1.What does the author want to tell us by the examples in paragraph 1?
A.Environmental adaptation of cattle raisers. B.New knowledge of human evolution.
C.Recent findings of human origin. D.Significance of food selection.
2.Where do the Bajau build their houses?
A.In valleys. B.Near rivers. C.On the beach. D.Off the coast.
3.Why was the young Jubilado astonished at the Bajau?
A.They could walk on stilts all day. B.They had a superb way of fishing.
C.They could stay long underwater. D.They lived on both land and water.
4.What can be a suitable title for the text?
A.Bodies Remodeled for a Life at Sea B.Highlanders’ Survival Skills
C.Basic Methods of Genetic Research D.The World’s Best Divers
高三英语阅读理解困难题查看答案及解析
As we reflect on the evolution of fitness over the centuries, and the emergence of a well- organized and growing "fitness” market and industry, it is well to ask ourselves: what have we lost, and what have we gained?
Obviously, much good has come out of these recent developments: there's widespread awareness of the importance of regular exercise, nearly every community has a gym or fitness club where people can go or pay to work out, and we understand more about how the human body works.Yet despite the many health and fitness methods, programs, and resources, the general population has never been so physically sedentary （久坐的）and out-of-shape. A recent World Health Organization report indicates that life expectancy （寿命）in the U. S. dropped for the first time since 1993. The health of modem people is declining, despite highly advanced medical technologies and the booming health and fitness industry.
How could that be? A large part of it is motivation. People are simply not as motivated to move their body and get healthy as they were in the past. We live in a society where the inability to operate one's body in a practical and effective manner is no longer an embarrassing condition. The fitness industry, no matter how good each new program claims to be, has failed to get the majority of people to value, practice, and enjoy physical exercise.
So, should we expect the answer to this dilemma to come from even more varied, or more technologically advanced programs and equipment? Or will the solution come from a different mindset, a simpler approach and practice, and overall a new culture?
1.What does the author tell us about fitness industry in paragraph 2?
A.It provides better technology.
B.It is supported by most people.
C.It brings about positive effects.
D.It costs people too much money.
2.What is the main reason why people fail to do physical exercise?
A.Not enough equipment. B.Lack of inner drive.
C.Misguided instructions. D.Embarrassing living conditions.
3.What does the author seem to agree with?
A.Change attitudes to fitness. B.Rely on standard practice.
C.Seek more potential customers. D.Turn to more advanced programs.
4.What is the best title for the text?
A.Lost in fitness B.Misunderstanding about fitness
C.Evolution of fitness D.Importance of fitness
高三英语阅读理解中等难度题查看答案及解析
The evolution of the first animals may have oxygenated（供氧）Earth's oceans. New research
led by the University of Exeter challenges the long held belief that oxygenation of the atmosphere and oceans was a precondition for the evolution of complex life forms.
The study, published in the journal Nature Geoscience, builds on the recent work of scientists in Denmark who found that sponges（海绵动物）一the first animals to evolve一require only small amounts of oxygen.
Professor Tim Lenton of the University of Exeter, who led the new study, said: "We argue that the evolution of the first animals could have played a key role in the widespread oxygenation of the deep oceans. This in turn may have facilitated the evolution of more complex, mobile animals."
Critical to determining oxygen levels in the deep ocean is the balance of oxygen supply and demand. Demand for oxygen is created by the sinking of dead organic material into the deep ocean. The new study argues that the first animals reduced this supply of organic matter一both directly and indirectly.
Sponges feed by pumping water through their bodies, "digesting" the tiny particles of organic matter, and thus helping oxygenate the shelf seas that they live in. By oxygenating more of the bottom waters, the first animals actually increased the removal of the essential nutrient phosphorus（磷）in the ocean. This in turn reduced the productivity of the whole ocean ecosystem, lowering oxygen demand and thus oxygenating the deep ocean.
A more oxygen-rich ocean created ideal conditions for more complex mobile animals to evolve, because they have a higher requirement for oxygen. These included the first predatory（肉食的）animals with guts（内脏）that started to eat one another, marking the beginning of the type of food webs we are familiar with today.
Professor Simon Poulton of the University of Leeds, who is a co-author of the study, added: "This study provides a possible mechanism for ocean oxygenation without the requirement for a rise in atmospheric oxygen. It therefore questions whether the long-standing belief that there was a major rise in atmospheric oxygen at this time is correct. We simply don't know the answer to this at present, which is ultimately key to understanding how our planet evolved to its current habitable state. Geochemists need to come up with new ways to explain oxygen levels on the early Earth."
1.The underlined word "facilitated" in Para. 3 is closest in meaning to＿＿．
A. prevented B. promoted C. interrupted D. witnessed
2.From paragraphs 4 to 6, we can infer that＿＿．
A. phosphorus can keep the productivity of the ocean ecosystem
B. complex animals consume the same amount of oxygen as sponges
C. the sinking of dead organic material into the deep ocean produces oxygen
D. the existence of the first animals marks the beginning of modern food webs
3. From the last paragraph, we can learn Pro. Simon Poulton believes that＿＿．
A. their study gives a new explanation for the high oxygen content in the air
B．oxygen increased greatly in the air as the first animals oxygenated the oceans
C. their study answers the question of how the earth evolved to the present state
D. ocean oxygenation does not necessarily require a rise in atmospheric oxygen
4.The main purpose of the passage is to＿＿．
A. present the view that the first animals played an active role in oxygenating oceans
B. introduce two opposite opinions on how the first animals oxygenated oceans
C．analyze how atmospheric oxygen stepped up the evolution of oceanic animals
D. explain how oceanic oxygen determines the amount of atmospheric oxygen
高三英语阅读理解中等难度题查看答案及解析