Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth. Today atmospheric carbon d

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问题 Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth.
Today atmospheric carbon dioxide concentrations are 31 percent more than that of______.

选项

答案1750

解析参见第3个小标题TYPES OF GREENHOUSE GASES下面第4段第3、4句：In 1750 there were about 281 molecules of carbon dioxide per million molecules of air．Today atmospheric carbon dioxide concentrations are 368 ppm，which reflects a 31 percent increase．

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大学英语六级

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Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth. Today atmospheric carbon d

大学英语六级

A、At8:35.B、At8:45.C、At8:00.D、At8:25.C根据女士的回答“every30minutes”，“7：30train”，“nexttrain”等关键词可计算出下一班火车是八点整，故选C。

Thefarmercancontinuetosupporthimselfandhisfamilyonlyifheproducesasurplus．

WhatisrequiredinmanydifferentsituationsinAmericanculture?Anexpressionof______.

Travelers【T1】______intotwocategories:thosewhomakelistsandthosewhodonot.Somepeopleprefertoplanthecourseofthei

Youthisnotamatteroftimebutamatterofself-improvement,bothphysicallyandmorally.Beingagoodyouth,oneshouldhave

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