Read the excerpt:

Cities are often several degrees warmer than the countryside around them, because concrete and asphalt absorb heat during the day and release it at night. One response is the green roof: a layer of soil and plants laid on top of a building. The plants shade the roof and cool the air as water evaporates from their leaves. Green roofs also hold rainwater, which reduces flooding in the streets below. However, they add weight, so older buildings may need to be strengthened first.

What is the function of the last sentence of the excerpt?

Answer and explanation

Correct answer: C. It points out a drawback of green roofs

  1. Step 1: The sentence begins with "However" and explains that green roofs add weight, which may require older buildings to be strengthened; this is a disadvantage. Answer: It points out a drawback of green roofs. Why not the others: The benefits come in the sentences before it, the cooling is explained in the third sentence, and the cause of urban heat is given in the first sentence.

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