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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单项选择题
In the proposal, the Interior Department______.
A．assessed the cause of the polar bears' decline in the coming decades
B．believed that the loss of ice is attributed to the heat-trapping gases
C．consulted the study on Arctic climate and ice trends
D．predicted manmade heat-trapping gases would cause temperature increase
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
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