_______ there are many different types of food, some animals spend their lives eating only one type.
A．SinceB．UnlessC．OnceD．While
D

試題分析： A. Since 自從，既然，B. Unless除非，C. Once 一旦，曾經(jīng)，D. While 雖然，然而，當(dāng)…時(shí)候，句意：雖然魚很多種不同的食物，但是一些動(dòng)物一生只吃一種食物。表示轉(zhuǎn)折關(guān)系，所以選D。
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