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Does Heroism Still Work
He......

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单项选择题
It CANNOT be inferred from the passage that______.
A．the department knows little respecting the science of global warming
B．the department is in the passive position in some cases
C．some social groups play significant roles in protecting environment
D．the department is reluctant to link heat-trapping gases with declining polar bear
单项选择题
Many experts hold that the forthcoming decline of polar bears is______.
A．directly caused by the diminishing Arctic ice
B．directly caused by the atmospheric buildup of heat-trapping gases
C．a symbol of the weather change
D．absolutely based on the emission of heat-trapping gases
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