You can think of this website as a window into the world of scientific research. In this primer, you’ll find a general discussion of the physical processes underlying the earth’s climate, an outline of the kinds of data that may shed light on how the climate is changing—and the role of human activity in these changes—and a description a some of the questions and uncertainties that researchers continue to explore. This primer is organized into four interconnected sections: the Atmosphere; the Hydrosphere(水圈); the Cryosphere(低温层); and the Biosphere(生物层).

　　1. We know from the text that “IPCC”___.

　　engages in the climate and changes about the earth.

　　is a group by scientists who like to walk around the moon

　　works in the World Meteorological Organization

　　often greets the passers-by from the outer space

　　2. We know from the text that carbon dioxide ___.

　　is one of the most important greenhouse gases

　　has fossil fuels

　　traps cold near the planet’s surface

　　exist in human activities

　　3. From the text, we know when we say the temperature of something has increased by about 0.7+ 0.2°C, the + 0.2°C means___.

　　the increase might by as small as 0.3°C or as great as 0.7°C

　　the increase might by as small as 0.5°C or as great as 0.8°C

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