【单选题】
Questions 19 to 22 are based on the conversation you have just hearD、A．They could be a sign of global warming.
B．They are disturbingAntarctic bird habitats.
C．They have destroyed research facilities.
D．They contradict current scientific theories.
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根据网考网移动考试中心的统计，该试题：
52%的考友选择了A选项
2%的考友选择了B选项
18%的考友选择了C选项
28%的考友选择了D选项
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