填空题

Apart from CO₂, which traps the sun’s radiation, other greenhouse gases like ______are also involved in warming.

【参考答案】

methane and chlororiuorocarbons (CFCs)

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填空题

The author holds the opinion that climate changes have started with the dawn of agriculture.

填空题

The warmest year on record occurred in 1998.

Apart from CO2, which traps the sun’s radiation, other greenhouse gases like ______are also involved in warming.