These nets are recognized by medical experts as the best hope for 22 the spread of malaria－Cambodia's most deadly disease. 23 the Health Ministry and the Malaria Center, The CAMBODIA DAILY will distribute the nets to the most 24 areas of the country. 25 to this campaign and save three lives for only $5, send your donation to: American Assistance for Cambodia, P.O.
答案：(B) eliminating
eliminate 是「根除、消滅」，用於疾病、貧窮、問題這類抽象事物，本句指蚊帳是遏止瘧疾擴散的最大希望；expanding（擴大）語意相反，deleting（刪除，用於文字資料）、assisting（協助）都不合。
eliminate 與 delete 的中文都能譯成「消除」，很容易當成同義字。兩者的使用對象不同：delete 用於文字、檔案、資料（delete a file 刪除檔案）；eliminate 用於疾病、貧窮、危險這類抽象事物（eliminate poverty 根除貧窮）。
空格前是介系詞 for，其後須接動名詞，四個選項都是 V-ing，故判斷的依據在語意。空格的受詞是 the spread of malaria（瘧疾的擴散），需要一個能以疾病擴散為受詞的動詞。作答線索在首句 The CAMBODIA DAILY is launching a world-wide campaign to wipe out malaria in Cambodia.（《柬埔寨日報》正發起一項全球性活動，致力於根除柬埔寨的瘧疾），全文的主張是遏止瘧疾；空格所在的句子又稱這些蚊帳為 the best hope（最大的希望），可知空格必為對抗疾病的動作。凡是空格前為介系詞、選項均為動名詞的題目，判斷步驟相同：先確認受詞是什麼，再檢查各選項慣用的受詞是否相符。
expanding 是「擴大」，方向與句意相反，蚊帳不會用來擴大疾病的擴散。deleting 的受詞須是文字或資料，不用於疾病。assisting 是「協助」，受詞多為人或事務，assisting the spread of malaria 反而成了助長擴散。另可一併記住 eliminate 用於競賽時是「淘汰」，常用被動：Our team was eliminated in the first round.（我們隊在第一輪就被淘汰）。
eliminate poverty／disease（根除貧窮／疾病）、be eliminated from a competition（在競賽中被淘汰）、delete a file（刪除檔案）、the spread of（…的擴散）。
The CAMBODIA DAILY is launching a world-wide campaign to wipe out malaria in Cambodia. You can help save three lives for only $5 by supporting this effort. Each and every dollar you contribute will go 21 the purchase of family-sized insecticide-treated mosquito nets costing $5 each. These nets are recognized by medical experts as the best hope for 22 the spread of malaria－Cambodia's most deadly disease.
23 the Health Ministry and the Malaria Center, The CAMBODIA DAILY will distribute the nets to the most 24 areas of the country. 25 to this campaign and save three lives for only $5, send your donation to: American Assistance for Cambodia, P.O. Box 2716, GPO, New York, NY 10116. Credit Card donations are also accepted.