Why are people building tall and narrow structures in the United States?

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问题 Why are people building tall and narrow structures in the United States?
People across the United States are putting up tall and narrow structures to help a little bird called the chimney swift. They hope the birds will use these structures as nesting areas and resting places. Chimney swift’ s numbers are decreasing as the shape and design of the nation’ s buildings change. People are tearing down old factory buildings and schools. Many of these structures have chimneys.

选项 A、To take place of the schools’ old chimneys.
B、To be used for chimney swifts’ nesting and resting.
C、They’re part of the newly-built factory buildings.
D、It’s a new shape and design of the nation’s buildings.

答案B

解析
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