单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20. What is the advantage of dry ice over ordinary ice

A．It takes a longer time to melt.
B．It is lighter than ordinary ice.
C．It is cleaner to use than ordinary ice.
D．It is not so cold as ordinary ice.

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单项选择题

单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20. What is the advantage of dry ice over ordinary ice 您的浏览器不支持 audio 元素。