单项选择题

Questions 15 to 17 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
What is the main topic of the talk

A．Different methods of pollination.
B．One example of an evolutionary strategy.
C．The food supply of the hummingbird.
D．Hummingbirds and hawk-moths.

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单项选择题

单项选择题

Questions 15 to 17 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. What is the main topic of the talk 您的浏览器不支持 audio 元素。