Many species are in ______ danger of extincti...

Many species are in ______ danger of extinction now due to the foolish actions of ______ human race.

A. the; the　　　　　 B. 不填; the

C. the; 不填　　 　　 D. 不填; 不填

高二英语单项填空中等难度题查看答案及解析

The volunteers try to convince people _____ the fact that some species are in danger of _____.

高二英语单项填空简单题查看答案及解析

The volunteers try to convince people _____ the fact that some species are in danger of _____.

A. for; dying away                         B. about; dying down

C. of; dying out                           D. on; dying off

高二英语单项填空中等难度题查看答案及解析

OSLO ( Reuters) -Six of the world's eight bear species are under threat of extinction after the addition yesterday of the sun bear, the world's smallest type of bear, to a "Red List" which says China's panda is most at risk. The sun bear is threatened partly by poachers(偷猎者)　 who sell its bile(胆汁)as medicine, said the World Conservation Union which runs the list of the threatened wildlife.

"Things are getting worse for all the bear species except the American black bear which is unquestionably increasing," said Simon Smart, senior species adviser for the Union.

The addition of the sun bear to the authoritative "Red List" after a major review means the American black bear and the brown bear, found from Europe to Alaska, are the only two of eight species still considered robust(强的) .　 The sun bear, found in Asia from Bangladesh to Borneo and weighing up to about 70kg, was rated "vulnerable(脆弱的) " by experts at the Union,which consists of more than 80 governments, conservation groups and scientists. The union said there were several thousand sun bears in the wild. "We estimate that sun bears have declined by at least 30 percent over the past 30 years, and continue to decline at this speed," said Ron Steinmetz, head of the Swiss- based Union's sun bear expert team.

Scientists did not change the level of threat to any bear species (except sun bears). Deforestation, loss of habitat to roads and cities and poaching are among risks. The Asian black bear, the sloth bear and the Andean bear were all proved again as vulnerable after reassessment of land-living bears.　 The polar, the only species not reassessed, is separately rated as vulnerable. Pandas were regarded again as endangered, one step closer to extinction than vulnerable, in spite of China's protection efforts for the bamboo-eaters.

1.How many kinds of threats are particularly mentioned to bear species?

A.2.　　 B.3.　　 C.4.　　 D.5.

2.According to the text, pandas.

A. are in the greatest danger of extinction on the "Red List"

B. are in less danger of extinction now with the China's protection efforts

C. are one step closer to extinction than ever before

D. are not among the 8 bears mentioned in the text

3.We can infer from the text that .

A. the World Conservation Union is not in charge of protecting wildlife in the world

B. pandas are rated as endangered after the reassessment

C. there are several kinds of land-living bears in the world

D. sun bears remain " vulnerable ", compared with 30 years ago

高二英语阅读理解简单题查看答案及解析

There are many things in different areas ________ we can do to reduce the possible dangers of AIDS.

高二英语单项填空简单题查看答案及解析

There are many things in different areas ________ we can do to reduce the possible dangers of AIDS.

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

高二英语单项填空中等难度题查看答案及解析

There are many things in different areas ________ we can do to reduce the possible dangers of AIDS.

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

高二英语单项填空中等难度题查看答案及解析

There are many kinds of birds in Australia, and over 140 species of snakes, ______are extremely dangerous.

A. many of those        B. many of that       C. many of which    D. many of what

高二英语单项填空中等难度题查看答案及解析

Sharks have lived in the oceans for over 450 million years. There are now about 360 species of sharks, whose size, behavior, and other characteristics differ widely.

Sharks range in size from the 0.1 meter long dwarf-dog shark to the 18-metre long whale shark — the world’s biggest fish. The whale shark, like two other large shark species — the basking shark and the megamouth shark — are harmless to people because they feed on plants and small aquatic animals.

Sharks have extremely sensitive sense organs. Some sharks can detect the scent(气味) of decaying fish or blood even when it is diluted(稀释) to only one part per million parts of seawater. They can probably hear underwater sounds that originate as far as 3 kilometers away and can tell the direction from which underwater sounds are coming.

Sharks are key predators(肉食动物) in the world’s oceans, helping control the numbers of many other ocean predators. Without sharks, the oceans would be overcrowded with dead and dying fish.

Every year, we catch and kill over 100 million sharks, mostly for food and for their fins. Dried shark fins are used to make shark fin soup, which makes a profit for the sellers. Other sharks are killed for sport and out of fear. Sharks are vulnerable to overfishing because it takes most species 10 to 15 years to begin reproducing and they produce only a few offspring.

Influenced by movies and popular novels, most people see sharks as people-eating monsters. This is far from the truth. Every year, a few types of sharks injure about 100 people worldwide and kill about 25. Most attacks are by great white sharks, which often feed on sea lions and other marine mammals. They sometimes mistake human swimmers for their normal prey, especially if they are wearing black wet suits.

If you are a typical ocean-goer, your chances of being killed by an unprovoked(无缘无故的) attack by a shark are about 1 in 100 million. You are more likely to be killed by a pig than by a shark.

Sharks help save human lives. In addition to providing people with food, they are helping us learn how to fight cancer, bacteria and viruses. Sharks are very healthy and have aging processes similar to ours. Their highly effective immune system allows wounds to heal quickly without becoming infected, and their blood is being studied in connection with AIDS research.

Sharks are among the few animals in the world that almost never get cancer and eye cataracts. Understanding why can help us improve human health. Chemicals extracted from shark cartilage(软骨) have killed cancerous tumors in laboratory animals, and these chemicals may someday help prolong our life.

Sharks are needed in the world’s ocean ecosystems. Although they don’t need us, we need them. We are much more dangerous to sharks than they are to us. For every shark that bites a person, we kill one million sharks.

1.Which statement best expresses the main idea of the article?

A. There are many different species of sharks, but only a few of them are dangerous to humans.

B. Sharks are important to the ocean ecosystem and they are a valuable resource for humans.

C. Although some sharks are dangerous to humans, they can help save human lives.

D. Sharks always eat small fishes and they are an essential part of the world’s oceans.

2.Which question is NOT answered in the article?

A. How long does a shark live?

B. How many people are killed by sharks each year?

C. Why are sharks important in medical research?

D. What do humans kill sharks for?

3.It can be inferred from the passage that ______________.

A. movies have given people the wrong impression of sharks

B. most sharks are dangerous to humans

C. sharks will attack anyone who is wearing black

D. it is very likely that ocean-goers will be killed by a shark

高二英语阅读理解中等难度题查看答案及解析

Due to the policy of free highway fees on major holidays, too many passenger cars are trapped on the highways, causing heavy traffic jams, some even _______ for several hours.

A. held up        B. broken up       C. taken up      D. given up

高二英语单项填空中等难度题查看答案及解析