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问题 填空题

一个三角形的三个内角的度数比是1：2：1，这个三角形是______三角形，又是______三角形．

答案

1+2+1=4，

180°×

1
4
=45°，

180°×

2
4
=90°，

180°×

1
4
=45°，

有一个角是直角的三角形是直角三角形，

所以这个三角形是直角三角形，

又因为45°=45°

根据等腰三角形的性质可知，这个三角形是等腰三角形，

答：这个三角形是直角三角形，又是等腰三角形．

故答案为：直角；等腰．

单项选择题

某企业上年度存货平均占用40万元，本年度平均占用50万元，如果存货周转率从去年的5次降到今年的4次，则企业的销售成本增加（）万元。

A.10

B.0

C.40

D.50
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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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