One focus in the green roof research is the evaluation of suitable plant species.A．RightB．

Green Roof Inns正准备发行债券，拟定的利率是6%，半年付一次息，面值1000美元。该债券期限10年，

For a distributor to be successful, the exporter mustA．focus on one particular region.B．fi

Green roof is an ecologically sound strategy of spreading green in urban areas.A．RightB．Wr

One of the benefits of green roofs is the reduction of the heat island effect in cities.A．

Although green roof technology can create a garden－like environment, its potential market

Ms. Green______living in town for only one year, yet she seems to know everyone who comes