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
Most Americans______.
A．buy genetically-engineered foods
B．know the foods they buy are genetically engineered
C．want genetically-modified foods to be clearly labeled
D．eat genetically-modified foods
单项选择题
Which of the following is TRUE about the Interior Department according to the passage
A．It is concerned about global warming all the time.
B．It is efficient in probing into the cause of the melting ice.
C．It issued the proposal out of great sense of responsibility.
D．It is somehow inactive in prescribing the solution to the problem.
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