体验大学英语第三册第1课教案讲解

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大学体验英语综合教程第三版第三册

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2. tree frog

Also known as tree toad, tree frog refers to a family of small to medium-sized frogs, found in temperate and tropical areas throughout the world. Most tree frogs have expanded disks on their toes that enable them to cling to surfaces. Body color ranges from brown and gray to green. They eat mainly insects. The gray tree frog is common throughout the eastern United States.

3. The Millennium Ecosystem Assessment

The Millennium Ecosystem Assessment was released in March 2005. This 2,500-page report was drawn up by 1,300 researchers from 95 nations over four years. Surveying the planet, it made a number of conclusions that many have stressed for years. The key messages from the report included the following points:

●Everyone in the world depends on nature and ecosystem services to provide the

conditions for a decent, healthy, and secure life.

●Human activities have taken the planet to the edge of a massive wave of species

extinctions, further threatening our own well-being.

●The loss of services derived from ecosystems is a significant barrier to the achievement of

the Millennium Development Goals to reduce poverty, hunger, and disease.

●The pressures on ecosystems will increase globally in coming decades unless human

attitudes and actions change.