问题
单项选择题
锐角三角形的面积等于底乘高的一半，直角三角形的面积等于底乘高的一半，钝角三角形的面积等于底乘高的一半，所以，所有三角形的面积等于底乘高的一半。这个推理属于（）
A、演绎推理
B、完全归纳推理
C、不完全归纳推理
D、类比推理
答案
参考答案：B
解析：
【考点】树立科学思维的观念
【分析】符合完全归纳推理的条件。
【点评】难度适中。
搜题请搜索小程序“爱下问搜题”
锐角三角形的面积等于底乘高的一半，直角三角形的面积等于底乘高的一半，钝角三角形的面积等于底乘高的一半，所以，所有三角形的面积等于底乘高的一半。这个推理属于（）
A、演绎推理
B、完全归纳推理
C、不完全归纳推理
D、类比推理
参考答案：B
解析：
【考点】树立科学思维的观念
【分析】符合完全归纳推理的条件。
【点评】难度适中。
Jack’s brother bought a magazine called Choice. It introduces to its readers information about all kinds of products like cameras, computers, cars, etc. This information helps them make the best choice when they buy something.
Jack borrowed his brother’s magazine when he needed a new computer. “I’ll read about all the different computers,” he said, “And I’ll choose the best one.”
ThinkPad G450M-T4300: This computer comes with lots of good software. However it does not have much memory and is rather slow. At $3,600, it’s not very good value for money.
HP CQ40-506AX: This is the most expensive computer we tasted. However it is also the most
reliable(值得信赖的). It is very fast and has lots of memory. Though it’s 600 dollars more expensive than ThinkPad G450M-T4300, it is worth the extra money if you can afford it.
The Acer A175-78: At only $2,600, this is the cheapest computer we tasted. It has plenty of memory and is quite fast. However, it “crashed” twice while we were testing it and we cannot recommend(推荐) it for reliability.
Jack choose HP CQ40-506AX. “I know it’s expensive, brother,” he said. “But it will last me a long time and do everything I want it to do.”
| Types | Advantage | Disadvantage | 小题1: __ ___ |
| ThinkPad G450M-T4300: | Good software | Doesn’t have much memory and is rather slow. | $3,600 |
| HP CQ40-506AX | 小题2:________ | The most expensive | 小题3: |
| The Acer A175-78 | Plenty of memory and quite fast | 小题4:_______ | $2,600 |