_____there are many different types of food, some animals spend their lives eating only one type.
A．SinceB．AsC．DespiteD．While
D

試題分析：考查連詞。A自從；B正如；C盡管（介詞）；D盡管。句意：盡管有許多不同類型的食物，但一些動物一生只吃一種。故D正確。
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