For example, an outbreak of avian influenza in the USA in 1983–1984 resulted in the destruction of more than 17 million birds 28 nearly US$ 65 million.
答案：(C) at a cost of
【句型】at a cost of + 金額，固定搭配，表示「花費……的代價」，說明撲殺1700萬隻禽鳥所付出的經濟代價。with a view to（為了）、in regard to（關於）、on account of（因為）都不符合這裡「付出金錢代價」的語意。
四個選項都是幾個字合起來當一個介系詞用的組合，你會憑中文挑一個。
先看空格後面接的是什麼：nearly US$ 65 million（將近六千五百萬美元），一個金額。四個選項裡，後面能直接接金額、講「代價是多少」的只有 at a cost of。整句在說一九八三到八四年美國那場禽流感疫情導致超過一千七百萬隻禽鳥被撲殺，代價將近六千五百萬美元。填進去讀成 the destruction of more than 17 million birds at a cost of nearly US$ 65 million。
with a view to（為了、著眼於）後面接的是目的，而且接的是名詞或動名詞；in regard to（關於）帶出的是話題；on account of（因為）帶出的是原因——金額不是原因，是結果的代價。三個都是多字介系詞，形態吻合，容易被順手選走。
at a cost of ＋ 金額（代價為……）、at the cost of（以……為代價）、with a view to ＋ V-ing（為了、著眼於）、in regard to（關於）、on account of（因為）、the destruction of（對……的撲殺或摧毀）。
Avian influenza, or "bird flu," is a contagious disease caused by viruses that normally infect only birds and, less commonly, pigs. 26 all bird species are thought to be susceptible to infection, domestic poultry flocks are especially vulnerable to infections that can rapidly reach epidemic proportions.
Outbreaks of avian influenza 27 be devastating for the poultry industry and for farmers. For example, an outbreak of avian influenza in the USA in 1983–1984 resulted in the destruction of more than 17 million birds 28 nearly US$ 65 million. Economic consequences are often most serious in developing countries 29 poultry raising is an important source of income, and of food, for impoverished rural farmers and their families.
When outbreaks become widespread within a country, control can be extremely difficult. 30, government authorities usually undertake aggressive emergency control measures as soon as an outbreak is detected.