【单选题】
{{I}}Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20.{{/I}} What is dry ice made of
A、Chemicals.
B.Vapour.
C.Water.
D.Gas.
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根据网考网移动考试中心的统计,该试题:
19%的考友选择了A选项
19%的考友选择了B选项
10%的考友选择了C选项
52%的考友选择了D选项