题目内容：

    Today's buzz words, which include global warming and zero emissions, are causing everyday people (not just celebrities) to look for ways to reduce their carbon footprint. Based on this trend, entire districts, known as eco-communities, are being designed with green initiatives in mind. Dockside Green in Victoria, British Columbia, Canada is one of these communities. If everything goes according to plan, Dockside Green will be a self-sufficient community. The plans describe a variety of environmental features, some of which have never been seen.

Builders of Dockside Green have the environment in mind with every choice they make. They ensure proper ventilation (通风), and guarantee residents 100% fresh indoor air. Interior and exterior building materials, such as paints and wood, are natural and non-toxic (无毒的). Eco-conscious builders use bamboo wherever possible because it is durable and does not require pesticides to grow.

Energy efficiency is one of the top priorities in eco-communities, such as Dockside Green. Not only do energy-efficient appliances and light fixtures reduce the environmental impact of heating and hot water, they also save residents and business owners money. Dockside Green claims that home owners will use 55% less energy than average residents in Canada. Studies show that people use approximately 20% less energy when they are billed for exactly what they use. In addition, water is treated at Dockside Green and reused on site for flushing toilets.

Planners of eco-communities such as Dockside Green must take the future into account. Dockside Green plans on reusing 90% of its construction waste. They also plan to continue using local suppliers for all of their transport and maintenance needs. This is a great way to reduce emissions. Finally, plans are in the works for a high-tech heating system that will use renewable biomass instead of fossil fuels.

The first two stages of development at Dockside Green have already been completed, and many other plans are in the works. Other smaller eco-villages can be found around the world. Residents of these communities aim to reduce their carbon footprint and be models for sustainable living.

1.The purpose of the article is to ______ .

A.introduce eco-communities

B.describe Dockside Green's plans

C.advertise Dockside Green

D.illustrate sustainable living

2.According to the article, what percentage of energy saving will Dockside Green residents save？ ______

A.100%.

B.90%.

C.55%.

D.20%.

3.Bamboo is an environmentally friendly choice for builders because it ______ .

A.provides good air circulation

B.keeps pests out of houses

C.is toxic substances free

D.can be used for a long time

4.What will Dockside Green try to do in the future？ ______

A.To find fossil fuel alternatives.

B.To develop an interior transportation system.

C.To use most of construction waste again.

D.To cooperate with other eco-villages.