单选题
Many different animals may be taught to do some simple jobs if______. [A] they have enough food to eat [B] they learn they will get something to eat in return after doing them [C] they are sent to school
【正确答案】
B
【答案解析】[精解] 题干的意思是很多动物在什么前提下可以被教会做简单的工作。A的意思是如果它们有足够的食物吃。B的意思是如果它们知道它们做事情之后会得到些吃的作为回报。C的意思是如果送它们去学校。我们可以从原文中找到相关的内容“The scientists say that many different animals may be taught to do a number of simple jobs if they know they will get something to eat in return．”，据此我们就可以直接作出判断。故正确答案为B。