Warmer weather makes glaciers melt, adding more water to the ocean.The warmer temperatures also make water expand, so it takes up more space, causing the sea level to rise.The sea level has risen about 10－25 cm in the last 100 years.

　　__3__.Through burning coal, oil and gas, people have been increasing the greenhouse gases in the atmosphere, such as CO2.This adds to the power of the greenhouse effect, making the planet even warmer.

　　Many scientists believe that, if the warming is not stopped, there will be huge climate changes.__4__.

　　__5__， the sea will swallow up millions of homes and the world will be flooded with “climate refugees” looking for somewhere to live.

　　A.The main cause of global warming is human pollution

　　B.Should this come true

　　C.Without urgent help, the country's days are numbered

　　D.But Tuvalu is not the first place to face sinking into the sea

　　E.The sea level could rise by one meter this century

　　F.People face a lot of pollution

　　G.Much has been done about our planet

　　答案：1～5　 CDAEB

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