This may not sound like much, but it could change the Earth's climate as 22 before.
答案：(B) never
as never before 意為「以前所未有的方式」：升溫幅度聽起來不大，卻可能以前所未有的程度改變地球氣候；ever、always、yet 都無法與 as…before 構成這個說法。
答對率 39%。
as ___ before 這個結構看起來像少了什麼，你可能想填 ever（因為 ever before 眼熟）。但 ever 通常用在比較級或否定句之後（better than ever before、hardly ever），單獨接在 as 後面不成話。as never before ＝ 以前所未有的方式、程度前所未見，是一個固定說法：The country is changing as never before.（這個國家正以前所未有的方式改變）。
前一句說科學家預估未來一百年將再上升華氏二到六度；本句以 This may not sound like much, but…（這聽起來似乎不多，但…）轉折。有 but 就要有落差——後半必須把嚴重性拉高，「以前所未有的程度改變氣候」正是最強的說法。「看到 may not sound…but…，就知道作者要推翻讀者的第一印象。」
as never before（以前所未有的方式）、better than ever before（比以往更好）、hardly ever（幾乎從不）、This may not sound like much, but…（這聽起來似乎不多，但…）。
Average global temperature has increased by almost 1°F over the past century. Scientists expect it to increase an 21 2° to 6°F over the next one hundred years. This may not sound like much, but it could change the Earth's climate as 22 before.
Climate change may affect people's health both directly and indirectly. For instance, heat stress and other heat-related health problems are caused directly by very warm temperatures. 23, human health can also be affected by ecological disturbances, changes in food and water supplies, as well as coastal flooding.
How people and nature 24 climate change will determine how seriously it affects human health. Generally, poor people and poor countries are 25 probable to have the money and resources they need to cope with health problems due to climate change.