A. on average B. in theory

C. in practice D. on the spot

A. as if B. now that

C. so that D. even though

California condors are North America’s largest birds, with wind-length of up to 3 meters. In the 1980s, electrical lines and lead poisoning(铅中毒) nearly drove them to dying out. Now, electric shock training and medical treatment are helping to rescue these big birds.

In the late 1980s, the last few condors were taken from the wild to be bred(繁殖). Since 1992, there have been multiple reintroductions to the wild, and there are now more than 150 flying over California and nearby Arizona, Utah and Baja in Mexico.

Electrical lines have been killing them off. “As they go in to rest for the night, they just don’t see the power lines,” says Bruce Rideout of San Diego Zoo. Their wings can bridge the gap between lines, resulting in electrocution(电死) if they touch two lines at once.

So scientists have come up with a shocking idea. Tall poles, placed in large training areas, teach the birds to stay clear of electrical lines by giving them a painful but undeadly electric shock. Before the training was introduced, 66% of set-freed birds died of electrocution. This has now dropped to 18%.

Lead poisonous has proved more difficult to deal with. When condors eat dead bodies of other animals containing lead, they absorb large quantities of lead. This affects their nervous systems and ability to produce baby birds, and can lead to kidney(肾) failures and death. So condors with high levels of lead are sent to Los Angeles Zoo, where they are treated with calcium EDTA, a chemical that removes lead from the blood over several days. This work is starting to pay off. The annual death rate for adult condors has dropped from 38% in 2000 to 5.4% in 2011.

Rideout’s team thinks that the California condors’ average survival time in the wild is now just under eight years. “Although these measures are not effective forever, they are vital for now,” he says. “They are truly good birds that are worth every effort we put into recovering them. ”

【1】California condors attract researchers’ interest because they _________.

A. are active at night

B. had to be bred in the wild

C. are found only in California

D. almost died out in the 1980s

【2】Researchers have found electrical lines are _________.

A. blocking condors’ journey home

B. big killers of California condors

C. rest places for condors at night

D. used to keep condors away

【3】According to Paragraph 5, lead poisoning _________.

A. makes condors too nervous to fly

B. has little effect on condors’ kidneys

C. can hardly be gotten rid of from condors’ blood

D. makes it difficult for condors to produce baby birds

【4】This passage shows that _________.

A. the average survival time of condors is satisfactory

B. Rideout’s research interest lies in electric engineering

C. the efforts to protect condors have brought good results

D. researchers have found the final answers to the problem

—They are _________ some criminals.

A. searching ； searching

B. searching for；searching

C. searching；searching for

D. searching for；searching for

A. whatever B. therefore C. anyway D. thus

A. will not have B. have not had

C. do not have D. would not have

—________, David．You can make it．

A．No worry B．Come on

C．No problem D．That’s impossible

A. studied B. would study

C. had studied D. was studying

A. which B. where C. when D. as

The production of coffee beans is a huge, profitable business, but, unfortunately, full-sun production is taking over the industry and bringing about a lot of damage. The change in how coffee is grown from shade-grown production to full-sun production endangers the very existence of, certain animals and birds, and even disturbs the world’s ecological balance.

On a local level, the damage of the forest required by full-sun fields affects the area’s birds and animals. The shade of the forest trees provides a home for birds and other special(物种) that depend on the trees’ flowers and fruits. Full-sun coffee growers destroy this forest home. As a result, many special are quickly dying out.

On a more global level, the destruction of the rainforest for full-sun coffee fields also threatens(威胁)human life. Medical research often makes use of the forests' plant and animal life, and the destruction of such species could prevent researchers from finding cures for certain diseases. In addition, new coffee-growing techniques are poisoning the water locally, and eventually the world's groundwater.

Both locally and globally, the continued spread of full-sun coffee plantations (种植园)could mean the destruction of the rainforest ecology. The loss of shade trees is already causing a slight change in the world's climate, and studies show that loss of oxygen-giving trees also leads to air pollution and global warming. Moreover, the new growing techniques are contributing to acidic(酸性的) soil conditions.

It is obvious that the way much coffee is grown affects many aspects many aspects of life, from the local environment to the global ecology. But consumers do have a choice. They can purchase shade-grown coffee whenever possible, although at a higher cost. The future health of the planet and mankind is surely worth more than an inexpensive cup of coffee.

【1】【1】What can we learn about full-sun coffee production from Paragraph 4?

A. It limits the spread of new growing techniques.

B. It leads to air pollution and global warming.

C. It slows down the loss of shade trees.

D. It improves local soil conditions.

【2】【2】The purpose of the text is to .

A. entertain B. advertise C. instruct D. persuade

【3】【3】Where does this text probably come from ?

A. An agricultural magazine.

B. A medical journal.

C. An engineering textbook.

D. A tourist guide.

【4】【4】Which of the following shows the structure of the whole text?