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问题 填空题

小明今年a岁，爸爸今年b岁，再过5年后，他俩相差______岁．

答案

由“爸爸今年b岁，小明今年a岁”可知：

爸爸与小明年龄相差b-a岁，且这个数值是不变的，

所以说再过5年后，他俩仍然相差b-a岁；

故答案为：b-a．

填空题

According to traditional Cherokee beliefs, we are part of (1) . We don’t (2) with it and we’re not trying to (3) it. We are a part of the Great Life. And within the Great Life, there are three great Laws of Nature, which tell us how we have to live in (4) with everything else. The First Law of Nature is that you don’t take any life without real (5) . So we shouldn’t (6) needlessly. We believe everything is alive, including animals, plants and (7) . And so to us, taking the life of a plant is just as grave a 8() as taking the life of an animal. The Second Law is that everything we do should (9) the Great Life. And everything we do (10) the Great Life, and everything that (11) within the Great Life affects us. So it’s very important that what we do will not (12) other parts of the Great Life. The Third Law basically is that we don’t (13) where we live. And where we live is not our (14) , small community. It’s this (15) . We don’t pour chemical (16) down the drain because they all wind up in the water. It might seem a little difficult to live by those three laws in this (17) society. But there are still a lot of things that we can do to bring these laws into our lives, such as (18) , using the (19) as little as possible, and (20) gardening.
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单项选择题

在中小型局域网中，（）可以构成完整的解决方案。

A.接入层和汇聚层交换机

B.汇聚层和核心层

C.接入层和核心层交换机
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