Choose a, b, c or d as the best answer. 4. Which statement best summarises the main idea of this paragraph?单项选择题

题目图片
A

a. City roofs should be converted to green roofs to reduce urban heat.

B

b. Plants with solar panels on roofs reduce the need for heat in buildings.

C

c. The best option for the environment is green roofs with solar panels.

D

d. Urban heat is one of the most serious problems facing city councils.

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