题目
单选题阅读Passage 2，完成小题。 Passage 2 Forests give us shade, quiet and one of the harder challenges in the fight against climate change. Even aswe humans count on forests to soak up a good share of the carbon dioxide we produce, we are threateningtheir ability to do so. The climate change we are hastening could one day leave us with forests that emit morecarbon than they absorb. Thankfully, there is a way out of this trap--but it involves striking a subtle balance. Helping forestsflourish as valuable "carbon sinks" long into the future may require reducing their capacity to absorb carbonnow. California is leading the way, as it does on so many climate efforts, in figuring out the details. The state's proposed Forest Carbon Plan aims to double efforts to thin out young trees and clear brush inparts of the forest. This temporarily lowers carbon-carrying capacity. But the remaining trees draw a greatershare of the available moisture, so they grow and thrive, restoring the forest's capacity to pull carbon from theair. Healthy trees are also better able to fend off insects. The landscape is rendered less easily burnable. Evenin the event of a fire, fewer trees are consumed. The need for such planning is increasingly urgent. Already,since 2010,drought and insects have killedover 100 million trees in California, most of them in 2016 alone, and wildfires have burned hundreds ofthousands of acres. California plans to treat 35,000 acres of forest a year by 2020,and 60,000 by 2030 financed from theproceeds of the state's emissions-permit auctions. That's only a small share of the total acreage that couldbenefit, about half a million acres in all, so it will be vital to prioritize areas at greatest risk of fire or drought. The strategy also aims to ensure that carbon in woody material removed from the forests is locked awayin the form of solid lumber or burned as biofuel in vehicles that would otherwise run on fossil fuels. Newresearch on transportation biofuels is already under way. State governments are well accustomed to managing forests, but traditionally they've focused on wildlife,watersheds and opportunities for recreation. Only recently have they come to see the vital part forests willhave to play in storing carbon. California's plan ,which is expected to be finalized by the governor next year,should serve as a model. By saying "one of the harder challenges,"the author implies that________. A．global climate change may get out of control B． people may misunderstand global warming C． extreme weather conditions may arise D． forests may become a potential threat
单选题阅读Passage 2，完成小题。
Passage 2
Forests give us shade, quiet and one of the harder challenges in the fight against climate change. Even aswe humans count on forests to soak up a good share of the carbon dioxide we produce, we are threateningtheir ability to do so. The climate change we are hastening could one day leave us with forests that emit morecarbon than they absorb.
Thankfully, there is a way out of this trap--but it involves striking a subtle balance. Helping forestsflourish as valuable "carbon sinks" long into the future may require reducing their capacity to absorb carbonnow. California is leading the way, as it does on so many climate efforts, in figuring out the details.
The state's proposed Forest Carbon Plan aims to double efforts to thin out young trees and clear brush inparts of the forest. This temporarily lowers carbon-carrying capacity. But the remaining trees draw a greatershare of the available moisture, so they grow and thrive, restoring the forest's capacity to pull carbon from theair. Healthy trees are also better able to fend off insects. The landscape is rendered less easily burnable. Evenin the event of a fire, fewer trees are consumed.
The need for such planning is increasingly urgent. Already,since 2010,drought and insects have killedover 100 million trees in California, most of them in 2016 alone, and wildfires have burned hundreds ofthousands of acres.
California plans to treat 35,000 acres of forest a year by 2020,and 60,000 by 2030 financed from theproceeds of the state's emissions-permit auctions. That's only a small share of the total acreage that couldbenefit, about half a million acres in all, so it will be vital to prioritize areas at greatest risk of fire or drought.
The strategy also aims to ensure that carbon in woody material removed from the forests is locked awayin the form of solid lumber or burned as biofuel in vehicles that would otherwise run on fossil fuels. Newresearch on transportation biofuels is already under way.
State governments are well accustomed to managing forests, but traditionally they've focused on wildlife,watersheds and opportunities for recreation. Only recently have they come to see the vital part forests willhave to play in storing carbon. California's plan ,which is expected to be finalized by the governor next year,should serve as a model.
By saying "one of the harder challenges,"the author implies that________.
Passage 2
Forests give us shade, quiet and one of the harder challenges in the fight against climate change. Even aswe humans count on forests to soak up a good share of the carbon dioxide we produce, we are threateningtheir ability to do so. The climate change we are hastening could one day leave us with forests that emit morecarbon than they absorb.
Thankfully, there is a way out of this trap--but it involves striking a subtle balance. Helping forestsflourish as valuable "carbon sinks" long into the future may require reducing their capacity to absorb carbonnow. California is leading the way, as it does on so many climate efforts, in figuring out the details.
The state's proposed Forest Carbon Plan aims to double efforts to thin out young trees and clear brush inparts of the forest. This temporarily lowers carbon-carrying capacity. But the remaining trees draw a greatershare of the available moisture, so they grow and thrive, restoring the forest's capacity to pull carbon from theair. Healthy trees are also better able to fend off insects. The landscape is rendered less easily burnable. Evenin the event of a fire, fewer trees are consumed.
The need for such planning is increasingly urgent. Already,since 2010,drought and insects have killedover 100 million trees in California, most of them in 2016 alone, and wildfires have burned hundreds ofthousands of acres.
California plans to treat 35,000 acres of forest a year by 2020,and 60,000 by 2030 financed from theproceeds of the state's emissions-permit auctions. That's only a small share of the total acreage that couldbenefit, about half a million acres in all, so it will be vital to prioritize areas at greatest risk of fire or drought.
The strategy also aims to ensure that carbon in woody material removed from the forests is locked awayin the form of solid lumber or burned as biofuel in vehicles that would otherwise run on fossil fuels. Newresearch on transportation biofuels is already under way.
State governments are well accustomed to managing forests, but traditionally they've focused on wildlife,watersheds and opportunities for recreation. Only recently have they come to see the vital part forests willhave to play in storing carbon. California's plan ,which is expected to be finalized by the governor next year,should serve as a model.
By saying "one of the harder challenges,"the author implies that________.
A．global climate change may get out of control
B． people may misunderstand global warming
C． extreme weather conditions may arise
D． forests may become a potential threat
题目解答
答案
D