The fact has worried many scientists _____ the earth is becoming warmer and warmer these years.
A．which B．that C．as D．what
高三英语单项填空中等难度题
The fact has worried many scientists the earth is becoming warmer and warmer these years.
A. what B. which C. that D. though
高三英语单项填空中等难度题查看答案及解析
The fact has worried many scientists _____ the earth is becoming warmer and warmer these years.
A．which B．that C．as D．what
高三英语单项填空中等难度题查看答案及解析
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
A. what B. which C. that D. though
高三英语单项填空中等难度题查看答案及解析
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
A. what B. which
C. that D. though
高三英语单项填空中等难度题查看答案及解析
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
A. what B. which
C. that D. though
高三英语单项填空中等难度题查看答案及解析
The fact has worried the people across the world ___________ the earth is becoming warmer and warmer these years.
A. what B. which C. that D. where
高三英语单项填空中等难度题查看答案及解析
Some scientists believe that one of the most intelligent beings on Earth is in fact the octopus (章鱼).
Octopuses usually live at the bottom of river mouths and seas-areas which are not attractive to researchers. They are not social animals so it can be hard to study their interaction with others. And the octopus’ intelligence is not easy for humans to understand. When we observe some animals such as rats or dogs, we can often understand their behavior. Octopuses，however can seem like aliens (外星人). Scientists need to have a lot of imagination to understand what an octopus is thinking!
In the 1950s, the US Air Force sponsored scientists to study the way octopuses use their brains. They hoped that they could use this knowledge to help them build better computers. However, their brains were so complex that the scientists felt it of no significance to continue with it. Octopuses have a very complex nervous system and recent research suggests that they have some of their intelligence inside each arm, which means that each arm can “think” for itself. It also appears that they have a good memory, perhaps similar to a cat’s.
Perhaps the most striking thing about octopuses is their ability to change their color and body pattern. They do this to camouflage themselves to avoid their enemies and also to communicate with others. They can completely change their appearance in less than a second. It can change its skin to look like rocks, sand or planktron (浮游生物).
Some scientists have even suggested that these different patterns and colors are in fact a very hard language-and that each design is a different verb，adjective or noun. But nobody has been able to work out what they might be saying. There’s a long way to go to get to know the octopus completely.
1.What can we infer about the octopus’ intelligence from Paragraph 2?
A.It does not attract scientists. B.Little has been known about it.
C.It is equal to the cat’s or dog’s. D.Much has been done about it.
2.What can we say about scientists’ study on the octopus in the 1950s?
A.They had to give it up eventually. B.They used computers to help.
C.They found its arms could think. D.They judged it lived like a cat.
3.What does the underlined word “camouflage” in Paragraph 4 probably mean?
A.Relax. B.Strengthen. C.Hide. D.Express.
4.What does the author think of the octopuses?
A.They are the smartest animals. B.They’re easy to be seen in the sea.
C.It is useful to copy their language. D.It is difficult to understand them.
高三英语阅读理解中等难度题查看答案及解析
It is said that many kids are worried about the year 2012, , they think the earth will be destroyed by disasters.
A. when B. where C. as D. which
高三英语单项填空中等难度题查看答案及解析
Many of us have wondered what Earth is like beneath the surface. So have writers and scientists. In French novelist Jules Verne’s masterpiece Journey to the Center of the Earth, explorers go down to Earth’s center and discover amazing wonders.
But in real life, human beings haven’t even come close to the planet’s core (核心). The core is over 6,000 km down. The deepest hole ever created, according to the BBC, is the Kola Superdeep Borehole in Russia, which only goes 12.3 km down.
So how do we know about everything down below without any samples？
One good way to start is to think about the Earth’s density (密度), Simon Redfern of the University of Cambridge in the UK told the BBC.
“The density of the material on Earth’s surface is much lower than the average density of the whole Earth, so that tells us there’s something that has greater density,” Redfern said.
The challenge is to find out which heavy materials the core is made of. And the main material scientists have found is iron. The idea is that when Earth formed 4.5 billion years ago, a lot of iron made its way down to the core, taking up about 80 percent of it. Today scientists are still working on finding out which other materials the core could be made up of.
You might also wonder how we know the size of the core. There’s a one-word answer: seismology (地震学).
When an earthquake happens, seismic stations around the world record the shockwaves it sends throughout the planet. It’s like hitting one side of the planet with a huge hammer and listening on the other side for the noise.
Early research found that some shockwaves, called “S-waves”, went missing. S-waves can only travel through solid material, but not through liquid, so they must have found something molten in Earth’s center. By following the S-waves’ paths, scientists found out that rocks became liquid around 3,000 km down.
There are still many questions about the Earth’s core to answer. But the study of the dark world below isn’t just for scientists’ curiosity.
The movement of Earth’s molten iron core builds up a powerful magnetic (有磁力的) field. It protects us from radiation from the sun and is needed for compasses and GPS systems to work.
So perhaps none of us will ever set eyes on the core, but it’s good to know it’s there.
1.The author mentions Jules Verne’s novel Journey to the Center of the Earth in the first paragraph to .
A. discuss the possibility of going down to Earth’s center
B. show how much humans have discovered about Earth
C. paint a picture in our imagination of the dark world below
D. show humans’ deep interest in Earth’s center
2.We can learn from the article that “S-waves” .
A. are often used to predict earthquakes
B. cannot travel through liquid material
C. are the most noticeable shockwaves produced by earthquakes
D. can travel most rapidly at 3,000 kilometers below Earth’s surface
3.We can infer from the last three paragraphs that .
A. research into Earth’s core has hardly made any progress in recent years
B. improvements in GPS systems could help people find out more about Earth
C. Earth’s core helps to protect humans from harm
D. scientists are likely to reach Earth’s center within dozens of years
高三英语阅读理解中等难度题查看答案及解析
It is said that many kids are worried about the year 2012, _____ , they think the earth will be destroyed by disasters．
A．where B．as C．when D．which
高三英语单项填空中等难度题查看答案及解析