六级For a start, all animals, such as cows, pigs and sheep, always gas limed methane, which is the second most common green house gas after carbon dioxide.
首先,所有的动物,如牛、猪和羊,都是用气浸石灰的甲烷,这是仅次于二氧化碳的第二种最常见的温室气体。
2013年6月听力原文
六级Similarly, some couples don't have children because they don't want to sacrifice their own lifestyles to the lime and expense of a family.
同样,有些夫妇没有孩子,因为他们不想牺牲自己的生活方式来换取家庭的金钱和开支。
2013年12月阅读原文
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