题目内容

The priest made the ________ of the cross when he entered the church.

A. mark B. signalC. signD. gesture

 

C

【解析】

试题分析：考查名词：A. mark记号，B. signal信号，C. sign标志，D. gesture手势，句意：牧师进入教堂的时候，划了个十字（的标志）。选C。

考点：考查名词

 

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It was ______ the president's speech that the secretary spent the whole morning at home.

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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

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B. introduce two opposite opinions on how the first animals oxygenated oceans

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D. explain how oceanic oxygen determines the amount of atmospheric oxygen

 

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Yet life on this United Nations world heritage site has turned sour. Battles have broken out between fishermen and conservationists. Ecuador, which owns the islands, has sent a naval patrol (海军巡逻队) to put down disturbances.
The controversial director of the Galapagos National Park—which controls 97 percent of Galapagos land and the reserve extending to 40 miles offshore—has been fired, while an air of uneasy tension hangs over the islands, as the islanders prepare for election when they pick their representatives in Ecuador’s national assembly.
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The violence has been triggered by an alarming growth in the islands’ population. Puerto Ayora, on Santa Cruz island, housed just 45 inhabitants in the 50s. Today there are more than 10,000, while the islands' total population is more than 19,000 and growing by 6 percent a year, despite recently introduced a law to limit waves of immigrants fleeing the poor areas of Ecuador for a life “in paradise (天堂)”. On top ofthis, more than 100,000 tourists visit the islands every year.
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These moves have angered many local people, however. They want to exploit (开发利用) the islands’ waters and catch its protected species of sharks, lobsters and sea cucumbers, which can fetch high prices in Japan and South Korea.
Angry fishermen surrounded the Charles Darwin research station on Santa Cruz last February, threatened to kill Lonesome George—the last surviving member of the Pinta Island species of the Galapagos giant tortoise.
The situation got improved after the Ecuador government made concessions (让步) by increasing fishing quotas (配额), which angered conservationists. “It is tragic, the short-term gain of a few fishermen versus the long-term survival of the Galapagos,” said John McCosker of the California Academy of Sciences. “They are killing the golden goose.”
Then, the Ecuador government appointed Fausto Cepeda as the national park's new director, a post that has become a political football for the mainland government. There have been nine directors in the past 18 months.
This appointment was particularly controversial, however. Cepeda was known to have close ties with the fishing industry, and the rangers (管理员),who run the national park and reserve, rebelled.
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However, as the population continues to rise, the long-term pressures on the islands are serious and will not disappear that easily.
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A. The island’s swelling population.

B. The law to limit waves of immigrants.

C. A life in paradise.

D. The tourists’ visiting the islands every year.

2.How significant were the islands for Charles Darwin?

A. He based his theory on his studies there.

B. He built the Charles Darwin research center there.

C. He advocated the balance between ecology and people there.

D. He found the last surviving giant tortoise there.

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A. The dismissal of the previous director of the Galapagos National Park.

B. The exploitation of the islands.

C. The government's support of Galapagos Conservation Trust.

D. Cepeda’s close tie with the fishing industry.

4.We can learn from the passage that _______.

A. the projects of Galapagos Conservation Trust on the islands are profitable

B. conservationists get angry when fishermen are killing a goose

C. politicians from the mainland government play football on the islands

D. the government is trying to ease the tension

5.In Paragraph 13, what does the author mean by “The Ecuador government took no chances”?

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B. The government made no compromises.

C. The government did not run risks.

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