This kind of plant ______ grass in appearance...

This kind of plant ______ grass in appearance , so it’s difficult for the students to tell them.

A. reflects　　 B. instructs

C. resembles　　 D. shapes

高三英语单项填空简单题查看答案及解析

It is the best for this kind of plant to grow in ______ is warm and rainy.

A. that           B. what           C. which          D. where

高三英语单项填空困难题查看答案及解析

I believe a leaf of grass is________than a star in the sky．Every plant gives us pleasure in its own way．

A．not less than       B．no less            C．much less         D．more less

高三英语单项填空简单题查看答案及解析

We planted all kinds of fruits on the hill, ______ beaches, pears, apples and so on.

A. for example      B. as           C. as if        D. such as

高三英语单项填空中等难度题查看答案及解析

．Canada, ________ second to Russia in size, is ________ home to all kinds of animals and plants, making it famous for its natural scenery.

高三英语单项填空简单题查看答案及解析

A huge lake of salty water appears to be buried deep in Mars，scientists reported this week．The presence of water raises the chances of finding life on the red planet．The discovery is based on observations by a European spacecraft．It has excited experts．Water is necessary for life，and scientists have long hoped to prove that it is present on Mars．

Cassie Stuurman is a geophysicist at the University of Texas．In 2016，she found evidence of a huge ice deposit(沉积)on Mars．“If these researchers are right，this is the first time we’ve found evidence of a large water body on Mars．”Stuurman said．Researchers are not yet sure how deep the area of water is．So，they cannot say whether it is an underground pool，or just an area of soft and wet soil．

In order to find the water，Italian researchers examined radar signals．The signals were collected over three years by the European Space Agency’s Mars Express spacecraft．The results suggest that a 20-kilometer-wide water body lies below ice that is 1.5 kilometers thick．They believe the area is close to the planet’s southern pole．

Mars is very cold，but salt in the water may have kept it from freezing．It is the same as when you put salt on a road to prevent ice from forming．The water would be extremely cold，right at the point where it’s about to freeze．And it would be salty．Such conditions are not ideal for life to form．But，she said there are bacteria on the earth that have been able to survive in similar conditions．

Mars has been a popular planet for exploration，with some groups placing instruments on its surface and others examining it from space．In May，NASA launched another spacecraft，the InSight Mars lander which will dig deep into the data under the surface after it reaches a flat area of the planet in November．

1.Where do the Italian researchers believe the water body on Mars is?

A. In a poo1．

B. Above ice．

C. In soft and wet soil．

D. Near the southern pole of Mars．

2.What can we learn about the water on Mars from the text?

A. It is probably filled with creatures．

B. It flows on the surface of Mars．

C. It is mainly in the form of solid．

D. It is probably at the freezing point．

3.What will the InSight Mars lander do when it reaches Mars?

A. Dig a hole to protect the lander itself．

B. Explore the surface of Mars．

C. Gather information under the surface of Mars．

D. Examine Mars from space．

4.What is the main idea of the text?

A. Life used to exist on Mars．

B. Researchers find new species on Mars．

C. Mars will be the humans’second home．

D. Water is buried beneath Mars’surface．

高三英语阅读理解困难题查看答案及解析

Today, many species of animals and plants are endangered. This means they are in danger of becoming extinct and living on only in the pages of history books. The famous dodo is a classic example of a creature that became extinct. A flightless bird that lived on the island of Mauritius, it was discovered by sailors in 1598 but was hunted to extinction by 1681.

Hunting has caused the Bengal tiger and the African elephant to be endangered today but habitat destruction can also lead to extinction. This is equally true for plants. Animals and plants disappear for other reasons too, but the main cause is often a disruption（打乱，破坏） in the natural food chain, whether due to hunting, habitat destruction, or even the introduction of alien species.

The natural food chain is the cycle that governs the existence of all life on this planet. It is a carefully balanced cycle and any imbalance that occurs can cause knock-on effects that have serious consequences. At the beginning of the natural food chain are plants which turn sunlight into energy and draw nutrients from the earth. Plants are called producers.

After the producers come the consumers. There are three tiers of consumers. First are creatures such as plant-eating animals, fish and insects which feed off the producers. These animals that only eat plants are called herbivores. The second tier of consumers are carnivores - animals that live off other animals. The third tier of consumers eats both other animals and plants. These consumers, including most humans, are called omnivores.

After animals and plants die, they become food for other smaller creatures, such as bacteria and some plants, such as fungi. As they feed, these creatures turn the dead bodies back into gases and minerals which are again food for the producers at the beginning of the food chain. And so the cycle continues.

All of nature is connected and governed by hundreds of these delicate food chains and if a single plant in the chain cannot survive, then the insects that live off the plant start to die and the animals that eat the insects also start to die.

When a food chain is disrupted, the consequences can be extremely serious. One estimate suggests that for each plant species that is lost, up to 30 animals and insects may also die out. One wonders how many species were affected by the extinction of the dodo?

Humans can have disastrous effects on food chains. We've already mentioned hunting but now let's look at travel. When people first started to explore the world they took plant and animal species from their home countries and introduced them wherever they went. They didn't realize that by introducing alien species they were disrupting the natural food chains of the areas they discovered. Although there are strict rules in place today controlling the import and export of alien species, some places are still fighting the effects of aliens introduced hundreds of years ago.

For example, Gough Island in the South Atlantic Ocean is a breeding ground for albatrosses that have been nesting there for centuries. But in the 19th century, mice from passing ships were brought to the island. Being a species alien to the island, they had no natural predators and have now grown to such a size that they are attacking and killing albatross chicks. If they are allowed to continue, they will wipe out the albatross population.

With import laws and people's rising awareness of how humans affect the natural environment, hopefully we can learn to fit better into the natural food chains that govern our world. Otherwise we need to accept that the loss of any more plants and animals could eventually mean our own extinction.

1.What do the first two paragraphs mainly tell us?

A. Hunting and habitat destruction lead to extinction.

B. Many species of animals and plants are endangered.

C. Plants and animals become extinct for the same reasons.

D. The main cause of extinction is often a disruption in the natural food chain.

2.Which of the following sentence is TRUE according to the passage?

A. Strict rules alone can remove the bad effects of alien species.

B. Plants, herbivores and carnivores are the three tiers of consumers.

C. If a bird becomes extinct, the relevant food chain will be disrupted.

D. Animals and plants become extinct because alien species are imported.

3.By mentioning the mice in Gough Island, the author intends to highlight ______.

A. mice worldwide are growing all the time

B. being aliens, they had no natural predators

C. some places are still fighting the effects of aliens

D. traveling can have disastrous effects on food chains

4.What is the best title of the passage?

A. Survival of the fittest.

B. Endangered animals and plants.

C. How to protect the natural environment.

D. The link between food chains and extinction.

高三英语阅读理解中等难度题查看答案及解析

On the one side of the road grass should be planted, and ______.

A. on the other are flowers          B. on another flowers

C. on the other flowers   D. on another are flowers

高三英语单项填空中等难度题查看答案及解析

高三英语阅读理解中等难度题查看答案及解析

Many _______ of years later, the first extremely small plants began to appear on the surface of the water.

A. millions　　 B. million　　　 C. million of　　　 D. millions of

高三英语单项填空中等难度题查看答案及解析