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 topic for this passage is ______.

A．cells and temperature
B．animal’s temperature
C．animal’s classification
D．standard of classification

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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 topic for this passage is ______. 您的浏览器不支持 audio 元素。