单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
This passage is mainly about ______.

A．studying twins
B．height and twinning
C．food and twinning
D．how to give birth to twins

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单项选择题

单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. This passage is mainly about ______. 您的浏览器不支持 audio 元素。