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.
Why did the hummingbirds leave the mountains

A．They prefer warmer weather.
B．There are not enough moths to eat.
C．They are looking for brighter flowers.
D．They don’t want to be caught by other pollinators.

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单项选择题

What is the source of the ethylene described in the talk

A．The fruit itself.
B．The air surrounding the fruit.
C．The spray applied by farmers.
D．The tree or vines to which the fruit is attache

单项选择题

What do the environmentalists worry about bluefin tuna

A．They might extinct due to over fishing.
B．Europe’s fishing nations might postpone the ban.
C．The price of bluefin tuna will soar in Japan.
D．Too much of bluefin tuna is exporte

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. Why did the hummingbirds leave the mountains 您的浏览器不支持 audio 元素。

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.
Why did the hummingbirds leave the mountains