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.
答案：(D) Indirectly
Indirectly 意為「間接地」，與前一句的 directly 形成對照：高溫直接造成熱衰竭等問題，人體健康也會間接受到生態擾動、糧食與水源變化的影響；Suddenly、Previously、Exclusively 都無法構成這組對照。
答對率 39%。讀懂前一句的人幾乎都對。
For instance, heat stress and other heat-related health problems are caused 「directly」 by very warm temperatures.（舉例來說，熱衰竭等問題是高溫「直接」造成的）——既然前一句用了 directly，本句自然要用 Indirectly 來接另一半。而且本句句中還有 also（也會受影響），再次確認這是在補上另一種途徑。「看到前一句有一個帶方向性的副詞（directly、physically、economically），下一句常常就是它的對照組。」
再往前一句是 Climate change may affect people's health both directly and indirectly.（氣候變遷可能直接與間接地影響人體健康）——作者先總說 directly and indirectly，再分別展開。本句正是「間接」那一半，結構完全對稱。
Suddenly（突然）、Previously（先前）、Exclusively（僅僅）都與 directly 構不成對照。
directly／indirectly（直接地／間接地）、both A and B（既 A 又 B）、be affected by（受…影響）、ecological disturbances（生態擾動）。
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.