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简述外保温墙体裂缝产生的原因有哪些?

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抹灰工程一般分几层?每一层的作用是什么?

Listen to Part 1 of Listening 2 and choose the best answer.1) How can we avoid dangerous consequences of global warming?

An international efforts involving all governments.
B. A joint effort of all the nations and individuals.

Which animals will produce less methane?

A. Cattle and sheep.
B. Pigs and chickens

Why does the speaker suggest that oil, natural gas and coal be used less?

A. Those sources of energy are limited.
B. Those sources of energy produce more CO2 emissions.

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