The surface of the table ______ smooth enough...

The surface of the table ______ smooth enough．

A．hash’t felt    B．isn’t feeling   C．doesn’t feel     D．isn’t felt

高二英语单项填空中等难度题查看答案及解析

The old man put his oars （船桨）in the water and _______ the smooth surface of the lake.

高二英语单项填空简单题查看答案及解析

Salty water just below the surface of Mars could hold enough oxygen to support the kind of microbial （微生物的） life that existed and developed quickly on Earth billions of years ago， researchers reported on Monday.

In some locations， the amount of oxygen available could even keep alive a primitive， multicellular （多细胞的） animal such as a sponge （海绵动物）， they reported in the journal Nature Geosciences. "We discovered that brines-water with high concentrations of salt - on Mars can contain enough oxygen for microbes to breathe，" said lead author Vlada Stamenkovic， a theoretical physicist at the Jet Propulsion Laboratory in California. "This fully revolutionizes our understanding of the potential for life on Mars， today and in the past. "

Up to now， it had been assumed that the trace （微量） amounts of oxygen on the Red Planet were insufficient to sustain even microbial life. "We never thought that oxygen could play a role for life on Mars due to its rarity in the atmosphere， about 0.14 percent，" Stamenkovic said. By comparison， the life-giving gas makes up 21 percent of the air we breathe.

On Earth， aerobic-that is， oxygen breathing -life-forms evolved （净化） together with photosynthesis （光合作用）， which converts CO2 into O2. The gas played a critical role in the existence of complex life， known after the so-called Great Oxygenation Event some 2.35 billion years ago.

But our planet also holds microbes -at the bottom of the ocean， in boiling hot springs -that live in environments lack of oxygen. "That's why -whenever we thought of life on Mars -we studied the potential for anaerobic （无氧的）life，" Stamenkovic said.

1.The underlined word "insufficient" in Para. 3 means " ______ ".

A.enough B.not enough

C.wrong D.right

2.Vlada Stamenkovic may agree that ______ .

A.this research changes people's understanding of the potential for life on Mars

B.the life-giving gas makes up 31 percent of the air people breathe on earth

C.Great Oxygenation Event happened some 2.35 million years ago

D.earth holds microbial life at the bottom of the desert

3.The main idea of the passage is ______ .

A.Mars is fit for living

B.multicellular animals are living on Mars

C.oxygen plays a role for life on earth

D.Mars is likely to have enough oxygen to support life

高二英语阅读理解困难题查看答案及解析

Scientists used to explore探测on the surface of the ocean. Now they are exploring below the surface, too. They want to know about ocean water and the plant and animal life deep in the ocean.

In 1934 the scientist William Beebe dived 3 000 feet below the surface in a hollow steel ball. In 1935 August Piccard dived 10330 feet. In 1960 his son Jean dived to a depth of 35 800 feet. All these early dives were deep. But the divers could not stay down for very long. They had to come back up to the surface after a few seconds. Scientists needed to stay down longer to study life below surface. Gradually they succeeded. Cousteau, a Frenchman, was able to keep men down to a depth of 90 feet for a week.

Now scientists are developing even better equipment. With this new equipment，men can stay below the surface for days or even weeks. In 1962 Cousteau set up a research station 35 feet below the surface. Then，in 1964，he set up another station on the ocean floor of the Red Sea. This was the first undersea station to operate without help from the surface.

Many countries are now studying undersea living. The former Soviet Union has an undersea laboratory in the Crimean Sea. The United States has a laboratory 50 feet down on the ocean floor off the Virgin Islands. In 1970 five men lived there for two weeks. Then a team of five women scientists stayed in the laboratory. Next came other teams of men. All were there to explore the ocean depths and to make plans for the use of its resources. Scientists hope to find enough mineral，vegetable，and animal wealth there to provide food for the entire world.

1.In order to______ ，scientists are exploring below the surface of the ocean.

A. know about the ocean water deep in the ocean

B. stay down longer to study life of the plant and animal below the surface

C. know about the plant and animal life deep in the ocean

D. both A and C

2.Who made the deepest dive______

A. William Beebe.

B. August Piccard.

C. Jean Piccard.

D. Cousteau.

3.Which of the following statements is true____

A. The early divers could not stay down for very long.

B. Up to now only five women scientists have stayed in the undersea laboratory.

C. The purpose of setting up the undersea laboratories is to make plans for the use of the resources in the ocean.

D. None of the above is true.

高二英语阅读理解中等难度题查看答案及解析

Floating on the surface of the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They move about lazily with the currents, providing a basic food for many larger animals. Plankton has been described as the equivalent (相等的东西) of the grasses that grow on dry land, and the comparison is an appropriate one. In potential food value, however, plankton far outweighs that of land grasses. One scientist has estimated that while grasses of the world produce about 49 billion tons of valuable carbohydrates(碳水化合物) each year, the sea’s plankton produces more than twice as much.

Despite its enormous food potential, little effort was made until recently to farm plankton as we farm grasses on land. Now scientists have at last begun to study this possibility, especially as the sea’s resources appear even more important as a means of feeding an expanding world population.

No one yet has seriously suggested that “planktonburgers” may soon become popular around the world. As a possible farmed supplementary food source, however, plankton is gaining considerable interest among scientists.

One type of plankton that seems to have great harvest possibilities is a tiny creature called krill(磷虾). Growing to two or three inches long, krill are a major food source for the giant blue whale, the largest animal ever to live on the Earth. Realizing that this whale may grow 100 feet and weigh about 150 tons, it is not surprising that each one swallows more than one ton of krill daily.

Krill swim about just below the surface in huge schools sometimes wide, mainly in the cold Antarctic. Because of their pink color, they often appear as an entire reddish mass when viewed from a ship or from the air. Krill are very high in food value. If krill can feed such huge creatures as whales, many scientists reason, they must certainly be competitors among possible new food sources for humans.

1.Which of the following correctly describes plankton?

A. It has a higher food value than grasses. B. It is food for most small sea animals.

C. It can grow on dry land as well. D. It grows up in the deep water.

2.Why does the author mention”planktonburgers” in Paragraph 3?

A. To show scientists’ interest in plankton.

B. To describe the appearance of plankton.

C. To question the food potential of plankton.

D. To suggest plankton as a possible food source.

3.According to Paragraph 4, the blue whale___________.

A. feeds mainly on krill. B. can grow up to 150 feet.

C. suffers from lack of food. D. was born two or three inches long.

4.Which of the following is TURE about krill?

A. They mainly live in the Arcitc. B. They are of great value to humans.

C. They are the smallest sea animals. D. They come in many different colors.

高二英语阅读理解简单题查看答案及解析

Global warming is the increase of the earth’s average surface temperature due to the effect of greenhouse gases, for example, carbon dioxide, which trap heat that would otherwise escape from the earth. After the trees are cut down and more greenhouse gases are released, the “blanket” around the earth called the ozone layer (臭氧层), will get thicker. This catches more heat and makes the earth hotter. Luckily, there are many things that every citizen of the earth can do to help reduce the effects of global warming, and it’s never too late or too early for children to take action.

The children should learn what a carbon footprint is. A carbon footprint is the amount of carbon and greenhouse gases people make as they lead the daily life and go about the normal activities. In other words, the carbon footprint is a measure of the environmental impact (冲击) the life has. To live an environmentally friendly life that doesn’t contribute to global warming, people want to have the smallest carbon footprint possible.

Almost everything people do contributes to global warming and is related to fossil fuel consumption. These can be direct uses of fossil fuels, like riding in a gasoline-powered car, or indicrect contributions to greenhouse gases, such as eating fruits or vegetables that had to be shipped from far way to reach their tables.

If a child wants to make a contribution to reducing global warming, he should ride a bicycle to the near park, school, his friend’s house, or anywhere else instead of taking the car. Or he may try to walk or jog, which is also helpful. In addition, although trains and buses often run on fossil fuels, on average, each person uses less energy and produces less pollution to run. Next time if children with their parents have to get around town or it’s too far to walk or bike, take the bus or other public transportation instead of asking for a ride.

1.What is the first paragraph mainly about?

A.A brief description of carbon footprint

B.The serious water pollution.

C.The protection of ozone layer.

D.The causes of global warming

2.Which of the following can describe the carbon footprint?

A.Useless. B.Expensive.

C.Helpful. D.Attractive.

3.What can kids do if they want to help reduce global warming?

A.Go to the near park by bus.

B.Walk or cycle as much as possible.

C.Keep staying at home or school.

D.Go around the town with parents by car.

4.What can be a suitable title for the text?

A.What Can People Do to Use Less Energy?

B.How Can Kids Help Reduce Global Warming?

C.How Does Carbon Footprints Measure Pollution?

D.Why Global Warming Affects Humans’ Life?

高二英语阅读理解中等难度题查看答案及解析

-How are things with you?

-________．I now make enough money to pay bills and keep food on the table．

A．From bad to wrose    B．Can’t complain

C．Too bad              D．Too good

高二英语单项填空中等难度题查看答案及解析

The old man showed us how to _____ part of the surface of the wood and let a pattern in.

A．cut down          B．cut in             C．cut out           D．cut up

高二英语单项填空简单题查看答案及解析

Earthquakes are the shaking, rolling or sudden shock of the earth’s surface. Earthquakes happen along "fault lines" in the earth’s crust. Earthquakes can be felt over large areas although they usually last less than one minute. Earthquakes cannot be predicted -- although scientists are working on it!

Most of the time, you will notice an earthquake by the gentle shaking of the ground. You may notice hanging plants swaying or objects wobbling on shelves. Sometimes you may hear a low rumbling noise or feel a sharp jolt. A survivor of the 1906 earthquake in San Francisco said the sensation was like riding a bicycle down a long flight of stairs.

The intensity of an earthquake can be measured. One measurement is called the Richter scale. Earthquakes below 4.0 on the Richter scale usually do not cause damage, and earthquakes below 2.0 usually can’t be felt. Earthquakes over 5.0 on the scale can cause damage. A magnitude 6.0 earthquake is considered strong and a magnitude 7.0 is a major earthquake. The Northridge Earthquake, which hit Southern California in 1994, was magnitude 6.7.

Earthquakes are sometimes called temblors, quakes, shakers or seismic activity. The most important thing to remember during an earthquake is to DROP, COVER and HOLD ON. So remember to DROP to the floor and get under something for COVER and HOLD ON during the shaking.

1. Which statement about earthquakes is not correct?

A. Earthquakes are the result of the sudden shock of the earth’s surface.

B. Earthquakes usually can be felt because they can last for a long time.

C. There are usually some signs for people to notice an earthquake.

D. People can feel an earthquake over 6.0 because it is very strong.

2. According to the passage, when the earthquake happened, a survivor of the 1906 earthquake in San Francisco_______.

A. was riding a bicycle                    B. was just climbing the stairs

C. heard a low rumbling noise                 D. felt like riding a bicycle

3. What can be inferred from the passage?

A. Most of the time, people can not feel or predict the earthquakes.

B. Earthquakes are sometimes called temblors, quakes shakers or seismic activity.

C. The Northridge Earthquake in Southern California in 1994 caused severe damage.

D. When an earthquake happens, it is important to drop on the floor immediately.

高二英语阅读理解简单题查看答案及解析

The initial tunnels were just ___________ the surface of the ground. People were transported in carriages, which were ___________ the narrow tunnels by steam engines.

A．under, broken through                   B．below, put through

C．of , gone through                       D．beneath, pulled through

高二英语单项填空中等难度题查看答案及解析