单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．$2.5.
B．$7.5.
C．$5.
D．$10.
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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
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
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