________ with the size of the whole earth，the...

___ with the size of the whole earth, the biggest ocean does not seem big at all.

A. Compare           B. When comparing       C. Comparing       D. When compared

高三英语单项填空中等难度题查看答案及解析

______with the size of the whole earth, the biggest ocean does not seem big at all.

A. Compare　　　　　 B. When comparing

C. Comparing　　 　　 D. When compared

高三英语单项填空中等难度题查看答案及解析

________ with the size of the whole earth，the biggest ocean does not seem big at all.

A．Compare　 B．When comparing

C．Comparing　　     　 D．When compared

高三英语单项填空中等难度题查看答案及解析

______ with the size of the whole earth, the highest mountain does not seem high at all.

A．When compared　 　　                 B．While comparing

C．Compare                              D．Comparing

高三英语单项填空中等难度题查看答案及解析

The next time someone asks you where the biggest ocean is, point them toward Jupiter. While earth harbours about 320 million cubic miles(1,333 cubic km)of water, our planet is practically a desert compared to the rest of the Solar System.

A moon of Jupiter called Europa, for example, which is roughly the size of our own Moon, likely hides a subsurface ocean with more than twice as much water as there is on Earth.

Yet even that pales into insignificance in comparison to Europa's neighbour Ganymede; more than 30 times as much water as our home planet is thought to reside there as liquid and ice.

And scientists keep finding more water wherever they look. On September 28, researchers reported that Dione — a small moon of Saturn — probably has a subsurface ocean, too.

To see just how Earth stacks up against other ocean worlds, Business Insider contacted Steve Vance, a planetary scientist at NASA's Jet Propulsion Laboratory who's calculated the numbers on just how much water might be out there.

In order of how much water they have, from the least to the most, they are: Enceladus, Dione, Earth, Europa, Pluto, Triton, Callisto, Titan, and Ganymede. Mimas, a moon of Saturn, and Ceres, the largest asteroid in the Solar System, are also thought to have subsurface oceans —but scientists aren't yet sure how big each one might be.

1.How many stars are mentioned in this passage?

A. Eleven.　　 B. Twelve.

C. Thirteen.　　 D. Fourteen.

2.What can we know according to the passage?

A. Compared with the Solar System, Jupiter looks as if it is a desert.

B. Ganymede is thought to be covered with more water than Europa.

C. Business Insider is a planetary NASA’s laboratory of Steve Vance.

D. Ceres harbours the largest subsurface ocean in the Solar System.

3.What does the passage mainly tell us?

A. The order of how much water the stars have has been figured out.

B. Scientists keep exploring more water in the universe wherever they look.

C. These ocean worlds reveal just how little water we have on Earth.

D. NASA’s planetary scientists are calculating the water numbers in the sky.

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

The ocean covers over 70 percent of the surface of Earth today, but over 3 billion years ago the entire planet may have been covered in water. To investigate what our planet was like billions of years ago, a team of researchers turned to indirect methods of analysis at a geological site in the Australian Outback known as Panorama(全景画) in the Pilbara Craton. Today, the region is 100 kilometers inland, but 3.2 billion years ago, it was deep underwater.

In fact, there were also once ancient hydrothermal vents (热水口) there where seawater bubbled up through the ocean floor. “There are no samples of really ancient ocean water lying around, but we do have rocks that interacted with that seawater and remembered that interaction,”　 lead author Benjamin Johnson, an assistant professor at Iowa State University, said in a statement.

The researchers collected over 100 of these rock　 samples and found something peculiar in them: a slightly higher amount of a particular isotope (同位素) of oxygen. The vast majority of oxygen on Earth is Oxygen-16 and contains eight protons (质子) and eight neutrons. However, about 0.20 percent is Oxygen-18.

Samples from Australia show the region’s ancient water contained more Oxygen-18 than present times. Since continents are covered in clay-rich soil that is efficient at trapping Oxygen-18, the team suggests that without continents covered in soil, more Oxygen-18 would have been present in the ocean. Their discovery indeed suggests there wasn’t much dry land available 3.24 billion years ago.

“There’s nothing in what we’ve done that says you can’t have tiny, micro -continents sticking out of the oceans,” added co-author Boswell Wing. “We just don’t think there were global-scale formations of continental soils like we have today.” The researchers don’t know when and how　 continents began to emerge out of the ocean but they plan to investigate “younger” rock formations to piece together a more precise timeline.

1.Where is the research site?

A.In a region deep underwater.

B.In a region off Australia.

C.In a region inland Australia.

D.In a region outside the Pilbara Craton.

2.What do the underlined words “interact with” in Paragraph 2 mean?

A.Have an effect on each other. B.Have a one-way effect.

C.Have a mysterious effect. D.Have a negative effect.

3.What’s the researchers’ conclusion after analyzing samples from Australia?

A.Modern earth must have been a water world.

B.Modern earth must have been a continental world.

C.Ancient earth may have been a water world.

D.Ancient earth may have been a continental world.

4.What’s the researchers’ next focus of the study?

A.To research continental soils’ formations.

B.To research the ocean’s formations.

C.To research “older” rock formations.

D.To research “younger” rock formations.

高三英语阅读理解中等难度题查看答案及解析

Millions of years ago dinosaurs (恐龙) lived on the earth. In the days of dinosaurs the whole earth was warm and wet. There were green forests and they could find enough to eat. Later, parts of the earth became cold and dry. and the forests there died. Then dinosaurs could not find enough to eat. This must be one reason why dinosaurs died out.

We can guess another reason. New kinds of animals came on the earth. Some had big brains and were fast and strong. They could kill dinosaurs. There may be other reasons that we don’t know about yet. Scientists are trying to make more discoveries about dinosaurs.

Dinosaurs were of many sizes and shapes (形状).  Some were as small as chickens, while some were about 90 feet long.

There were also terrible fights between dinosaurs. They might have happened more than 100 million years ago. Though there was no man to see any of the fights, we can be told by the animal’s footprints (足迹) that fight did take place.

1.According to the passage, dinosaurs did exist only ______on the earth.

2.One reason why dinosaurs died out is that______.

3.One more reason may be that ______.

4.We can see from this passage ______.

高三英语阅读理解中等难度题查看答案及解析

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式

The Pacific Ocean

The Pacific Ocean is the 1.　 (large) of the Earth’s oceans, 　 2.　 (cover) about 46% of the Earth’s water surface and 32% of its total surface area. It extends 　 3.　 the Arctic in the north to the Antarctica in the south, surrounded by Asia and Australia in the west and the Americas in the east.

The Pacific Ocean contains about 25,000 islands. The 　 4.　 (major) of them are found south of the equator. 　 5.　 water near the equator is less salty than that found in the mid-latitudes (中纬度) for 6. (abundance) equatorial precipitation (赤道降水) throughout the year.

The surface circulation of Pacific waters is 　 7.　 (general) clockwise in the Northern Hemisphere and counter-clockwise in the Southern Hemisphere.

The exploitation of the Pacific’s mineral wealth is various, 8. is influenced by the ocean’s great depths. In shallow waters off the coasts of Australia and New Zealand, natural gas is produced, and pearls 　 9.　 (harvest) along the coasts of Australia, Japan and the Philippines. One more thing worth 10. (mention) is that the Pacific’s greatest wealth is its fish.

高三英语语法填空中等难度题查看答案及解析

Earth is believed ______ by an object the size of Mars at some point in the distant past

before its surface cooled．

A．to be hit   B．to have hit       C．to have been hit       D．to hit

高三英语单项填空中等难度题查看答案及解析