单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
The following classifications of animals are mentioned EXCEPT ______.

A．warm-blooded and cold-blooded
B．constant body temperature and variation with environment
C．homeotherms and poikilotherms
D．mammals and plants

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单项选择题

单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. The following classifications of animals are mentioned EXCEPT ______. 您的浏览器不支持 audio 元素。