The author claims all of the following to be the benefits of rooftop gardens except _______.

* Hướng dẫn giải

A

Các đáp án B, C, D đều được nhắc đến ở đoạn cuối:

-  In the summer, rooftop  gardens prevent buildings from absorbing heat from the sun, which can significantly  reduce  cooling  bills.  In  the  winter,  gardens  help  hold  in  the  heat  that  materials  like brick and concrete radiate so quickly, leading to savings on heating bills.

- Rooftop vegetable and herb gardens can also provide fresh food for city dwellers

- Like parks, rooftop gardens help to replace carbon dioxide in the air with nourishing oxygen.

Chỉ có A là không được nhắc đến