In addition, bottled water produces an incredible amount of solid 30 .
答案：(A) waste
語意「瓶裝水產生大量的固體『廢棄物』」，waste（廢棄物）呼應後文「90%的瓶子沒有被回收，堆積在垃圾掩埋場」；resource（資源，語意相反）、ground（地面）、profit（利潤）都不合。
solid 在你腦中的第一個意思是形容詞「堅固的」，所以 solid ground（堅實的地面）看起來特別順，ground 就被選走了。這裡的 solid 其實是「固體的」，solid waste 是環保領域的常用說法：固體廢棄物。
答案就寫在下一句：90% of the bottles used are not recycled and lie for ages in landfills.（用過的瓶子有 90% 沒有被回收，長年堆在垃圾掩埋場裡）。landfill 是垃圾掩埋場，會被送進掩埋場的東西就是垃圾，所以空格是 waste。段落的邏輯也一致：這一段從 bottled water has other disadvantages 起就在列缺點，前一項是全球暖化，這一項是垃圾。順帶把 solid 的兩個身分分清楚：當形容詞是「固體的、堅固的」，當名詞用複數 solids 則是「固形物」——這一份考卷的第二篇 a higher percentage of solids（固形物比例較高）用的正是名詞。同一個字在同一份試題裡出現兩種用法，是命題常見的手法。
resource：資源，語意相反；若真要講回收再利用還說得通，但下一句明說 90% 沒有被回收。ground：地面，solid ground 這個搭配確實存在，但與「產生大量的…」接不起來，你不會說一家公司 produces solid ground。profit：利潤，與這一段的環保主題無關。
solid waste（固體廢棄物）、a waste of time（浪費時間）、an incredible amount of（數量驚人的…）、be recycled（被回收）、a landfill（垃圾掩埋場）、contribute to global warming（加劇全球暖化）。
Many people like to drink bottled water because they feel that tap water may not be safe, but is bottled water really any better? Bottled water is mostly sold in plastic bottles and that's why it is potentially health 26 . Processing the plastic can lead to the release of harmful chemical substances into the water contained in the bottles. The chemicals can be absorbed into the body and 27 physical discomfort, such as stomach cramps and diarrhea. Health risks can also result from inappropriate storage of bottled water. Bacteria can multiply if the water is kept on the shelves for too long or if it is exposed to heat or direct sunlight. 28 the information on storage and shipment is not always readily available to consumers, bottled water may not be a better alternative to tap water.
Besides these 29 issues, bottled water has other disadvantages. It contributes to global warming. An estimated 2.5 million tons of carbon dioxide were generated in 2006 by the production of plastic for bottled water. In addition, bottled water produces an incredible amount of solid 30 . According to one research, 90 of the bottles used are not recycled and lie for ages in landfills.