单项选择题

Question 17 to 20 are based on the follwing passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. What is a possible reason that birds began to build nests in trees

A.It is warmer in trees.
B.It is easier to build nests in trees.
C.It is safer in trees.
D.They have a better view on high.

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Question 17 to 20 are based on the follwing passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. What is a possible reason that birds began to build nests in trees 您的浏览器不支持 audio 元素。