题目内容
_______ there are many different types of food, some animals spend their lives eating only one type.
| A．Since | B．Unless | C．Once | D．While |
D
解析试题分析： A. Since 自从，既然，B. Unless除非，C. Once 一旦，曾经，D. While 虽然，然而，当…时候，句意：虽然鱼很多种不同的食物，但是一些动物一生只吃一种食物。表示转折关系，所以选D。
考点：考查连词
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