[简答题]Change
As relentlessly bad as the news about global warming seems to be, with ice at the poles melting faster than scientists had predicted and world temperatures rising higher than expected, there was at least a reservoir of hope stored here in Canada’s vast forests.
The country’s 1.2 million square miles of trees have been called the "lungs of the planet" by ecologists because they account for more than 7 percent of Earth’s total forest lands. They could always be depended upon to suck in vast quantities of carbon dioxide, naturally cleansing the world of much of the harmful heat-trapping gas.
But not anymore. In an alarming yet little-noticed series of recent studies, scientists have concluded that Canada’s precious forests, stressed from damage caused by global warming, insects and persistent fires, have crossed an ominous (危险的) line and are now pumping out more climate-changing carbon dioxide than they are sinking. Worse yet, the experts predict that Ca

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[单项选择]Change
As relentlessly bad as the news about global warming seems to be, with ice at the poles melting faster than scientists had predicted and world temperatures rising higher than expected, there was at least a reservoir of hope stored here in Canada’s vast forests.
The country’s 1.2 million square miles of trees have been called the "lungs of the planet" by ecologists because they account for more than 7 percent of Earth’s total forest lands. They could always be depended upon to suck in vast quantities of carbon dioxide, naturally cleansing the world of much of the harmful heat-trapping gas.
But not anymore. In an alarming yet little-noticed series of recent studies, scientists have concluded that Canada’s precious forests, stressed from damage caused by global warming, insects and persistent fires, have crossed an ominous (危险的) line and are now pumping out more climate-changing carbon dioxide than they are sinking. Worse yet, the experts predict that Ca
A. they balance the world temperatures
B. they are abundant to cleanse the earth’s atmosphere and play an important role in cleansing the earth’s atmosphere
C. they could always suck in vast quantities of carbon dioxide
D. they naturally cleanse much of the harmful heat-trapping gas

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[单项选择]

{{B}}Change{{/B}}
As relentlessly bad as the news about global warming seems to be, with ice at the poles melting faster than scientists had predicted and world temperatures rising higher than expected, there was at least a reservoir of hope stored here in Canada’s vast forests.
The country’s 1.2 million square miles of trees have been called the "lungs of the planet" by ecologists because they account for more than 7 percent of Earth’s total forest lands. They could always be depended upon to suck in vast quantities of carbon dioxide, naturally cleansing the world of much of the harmful heat-trapping gas.
But not anymore. In an alarming yet little-noticed series of recent studies, scientists have concluded that Canada’s precious forests, stressed from damage caused by global war
A. they balance the world temperatures
B. they are abundant to cleanse the earth’s atmosphere and play an important role in cleansing the earth’s atmosphere
C. they could always suck in vast quantities of carbon dioxide
D. they naturally cleanse much of the harmful heat-trapping gas

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