PTE Reading
Re-order Paragraphs
1 questions. Answer them all, then submit once for your section score.
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1.
Re-order Paragraphs
Arrange the sentences into the correct order.
Put the sentences in the correct order:
- Today they are valued not only for their beauty but for the way they cool buildings in summer and soak up rainwater that would otherwise flood city drains.
- Once lightweight drainage mats and root-blocking membranes solved those engineering problems, rooftop gardens became common on office towers and apartment blocks alike.
- This idea spread slowly at first, limited by concerns over waterproofing and the extra weight a wet garden bed places on a roof's frame.
- In response, architects began experimenting with soil and vegetation layered directly onto flat building roofs, insulating the structure below while giving residents a patch of green they could otherwise never have.
- As cities grew denser through the twentieth century, planners struggled to find open ground for greenery, since every available lot had already been paved over or built upon.