A Right B Wrong C Not mentioned
18. Small plants like grasses and herbs are grown widely on intensive green roofs.
A Right B Wrong C Not mentioned
19. Green roof is an ecologically sound strategy of spreading green in urban areas
A Right B Wrong C Not mentioned
20. One of the benefits of green roofs is the reduction of the heat island effect in cities
A Right B Wrong C Not mentioned
21. One focus in the green roof research is the evaluation of suitable plant species
A Right B Wrong C Not mentioned
22. Although green roof technology can create a garden—like environment，its potential market is rather small.
A Right B Wrong C Not mentioned
