1 . The Amazon is warming three times faster than the global average

It is perhaps the most ironic symbol of the life on our planet. The Amazon is the world’s largest and most bio-diverse tropical rainforest and a huge trap for carbon dioxide. The harms of _________ in this vital resource are old news. But now, the time on the clock is running out. It seems that the world’s biggest rainforest is about to turn into the world’s biggest environmental _________. “We are about to collapse,” says Luciana Gati at Brazil’s National Institute for Space Research. “We are in a(n) _________, we need action now.”

Gati has spent years _________ the Amazon from the air. She believes we are as little as five years from a point of no return, where rainforest begins to turn into dry land. It is also the point at which billions of tons of carbon would be _________ into the atmosphere. “It’s a nightmare,” she says.

That nightmare situation is the well-known Amazon _________ point, where the ecosystem can no longer cope with the damage of the forest cutting. Like a domino game, one brick falling will _________ the whole tower to collapse in a heap.

Warnings that this is approaching have now taken on extreme urgency. The rate of deforestation has increased sharply and is fast approaching the theoretical _________. In September, a group of more than 200 experts, including Gatti, released an assessment of the situation. The conclusion: we are on the _________ of disaster.

Scientists first began to seriously worry about a potential Amazon tipping point in about 2000, when some studies warned that a combination of climate change and deforestation could cause the rainforest to __________.

A few years later, a team of Brazilian scientists put numbers on it. They __________ that in central, southern and eastern parts of the Amazon, a loss of 40% of the forest cover from pre-industrial levels, or 3°C warming would reduce rainfall so much that the rest of the forest would die of __________ and turn into a dry land in less than a decade.

The scientists have since __________ that prediction, partly due to the global warming that has happened since 2000. The Amazon is already 1.2°C warmer than it was in pre-industrial times and is warming three times faster than the global __________. At that rate of warming, between 20 and 25% deforestation would be enough to dry up the land and destroy the Amazon completely.

“Either way, we would be wise not to exceed 20%”, says a scientist, “for the commonsense reason that there is no point in __________   the precise point of limit by tipping it.”

1.

A．fertilization

B．elimination

C．deforestation

D．frustration

2.

A．program

B．disaster

C．protection

D．regulation

3.

A．evolution

B．spotlight

C．condition

D．emergency

4.

A．measuring

B．observing

C．protecting

D．criticizing

5.

A．released

B．melted

C．turned

D．supplied

6.

A．tipping

B．disappointing

C．awarding

D．tapping

7.

A．build

B．turn

C．cause

D．make

8.

A．problem

B．prediction

C．aspect

D．limit

9.

A．base

B．edge

C．surface

D．track

10.

A．dry out

B．run down

C．pay off

D．rise up

11.

A．boasted

B．insisted

C．estimated

D．instructed

12.

A．thirst

B．starvation

C．cold

D．disease

13.

A．digested

B．revised

C．encouraged

D．previewed

14.

A．strategy

B．climate

C．average

D．system

15.

A．diagnosing

B．instructing

C．inquiring

D．discovering

2 . Greening the blue

Is there a “natural” way to enhance the potential of the oceans to lock away climate-warming CO₂? Planting more trees on land can help draw down more CO₂ from the atmosphere—the basis of many plans for carbon credits that companies buy to offset their emissions (抵消其排放).     1     Seaweed forests and saltmarshes (盐碱滩) are common examples.

Some regard the potential for this “blue carbon” as huge, although as yet there is no mechanism for integrating it into carbon offsetting plans. John Virdin of Duke University in North Carolina says, “    2    ” He adds, “You have to go out and measure all the carbon that’s there, you have to show that it’s not going to be lost, you have to keep monitoring it.” Virdin and others have proposed extending an existing land-based plan called REDD + (reducing emissions from deforestation and forest degradation) to the ocean, but that is an idea whose ship has yet to sail.

    3     In March, the UK government’s climate adviser, the Climate Change Committee, found that restoring and creating seagrass and saltmarsh ecosystems in the country would only lock away a small amount of CO₂, removing “well below” 1 million tonnes a year. Nonetheless, these are efficient carbon stores according to the committee.     4    

A．Using the oceans as a solution to climate change is hardly a new idea.

B．There is still some doubt about how big the marine offsetting effect might be.

C．It’s really hard to turn blue carbon conservation and restoration into carbon credits that you can sell.

D．Something similar might work in the oceans, by stimulating the growth of marine and coastal ecosystems.

E．And conserving them is important given how much fishing and other activities have degraded them.

F．The big objection to all these plans is the possibility of negative environmental side effects.

3 . After five long years, it appears California’s drought is finally becoming less severe. _______ a recent string of storms, more than a third of the state has now welcomed healthy precipitation (降水量), and California’s snowpack—a(n) _______ source of water as the year progresses—has reached nearly twice its seasonal average in some parts of the Sierra Nevada. That’s a dramatic improvement over last summer, when literally every inch of the state _______ drought conditions. It’s also welcome news for Californians, who have faced a series of water _______ since Governor Jerry Brown declared a state of emergency in early 2014. Farmers have been forced to spend heavily to maintain production.

The state’s water struggles, _______, are far from over. For one, nobody knows for sure how long these rains will last. Although recent precipitation has been _______—in some places more than 80 inches—the accuracy of storm forecasting remains _______ beyond a week. Californians know this all too well: last year, experts projected a “Godzilla” El Niño that would bring record levels of precipitation. It never _______. “Will six weeks from now be wet?” asks Jeanine Jones, California’s interstate water-resources manager. “The skill in that kind of forecasting is just not there.”

_______, a storm slowdown is a very real possibility—and it could leave California without enough water to make it through the dry summer. ________, when that happens, the state has turned to groundwater stored in natural rock formations deep beneath the earth’s surface. But those ________ remain used up after years of drought; restoring them could take years in some places, says Jones.

The quick inrush of water has also created a(n) ________ balancing act for water managers. Keeping surface reservoirs (水库) filled to the edge protects against the possibility of a sudden dry spell, but it also

________ the risk of flooding if and when future storms hit. To that end, water managers opened the Sacramento Weir floodgates earlier this month to pour reservoir water into nearby fields after ________ showed local water levels would likely continue to rise. That’s a calculation that will be made across the state in the coming months.

For now, though, Jones is focused on planning and ensuring the state’s water supply whatever may happen. “We’re halfway through our wettest season, and conditions have been encouraging,” she says. “I would say we’re ________ optimistic.”

1.

A．According to

B．With respect to

C．Thanks to

D．In addition to

2.

A．official

B．exhaustible

C．unexpected

D．crucial

3.

A．experienced

B．improved

C．worsened

D．investigated

4.

A．pollution

B．restrictions

C．pressure

D．cycles

5.

A．nevertheless

B．therefore

C．meanwhile

D．moreover

6.

A．accurate

B．plentiful

C．consistent

D．emergent

7.

A．productive

B．unchangeable

C．progressive

D．unreliable

8.

A．fell behind

B．broke down

C．came about

D．took off

9.

A．Or else

B．In other words

C．At that point

D．Above all

10.

A．Literally

B．Contrarily

C．Historically

D．Consequently

11.

A．levels

B．formations

C．struggles

D．reserves

12.

A．random

B．delicate

C．mechanical

D．insensible

13.

A．heightens

B．assumes

C．minimizes

D．identifies

14.

A．restorations

B．calculations

C．conditions

D．projections

15.

A．hopelessly

B．extremely

C．guardedly

D．cheerfully

4 .    

A．It was miserable all day long.	B．The trip was ruined by the bad weather.
C．It was sunny on Saturday morning.	D．The trip turned out to be good.