4．
Have you ever thought，"Why do I have to learn math？I'm never going to use it!"Sometimes students think math is （66）justsomething to bore them，and that it has no practical
（67）valueat all．Is it true？
Math is the tool and language of economics，engineering and other sciences．It is （68）usedin almost every field of the world．When workers build buildings with perfectly square corners，the Pythagorean Theorem （勾股定理） is （69）helpful．When you want to know what scores you need to get on a final exam to become the top 10 percent of your grade，math can help you．Even your HDTV （高
清電視） relies on mathematics，too．
Moreover，math provides us （70）witha lot of skills in problem solving．When （71）solvinga math problem，we need to define the problem，think of ways and use a certain method to get the results．In this way，you （72）developyour ability to make complex （復(fù)雜的） decisions down the road．Besides，math teaches us logic （邏輯） and order．When we want to get a certain result in math，we must （73）followexact steps．The training of mind that children
achieve in math class can carry over into everyday life．?
（74）Throughmath，we can also learn some thinking skills．For example，when students are required to explain （75）howthey get to a way of a complex problem or to describe the ideas behind a formula，they are in fact using a way of thinking．
You may never need to use the quadratic equation （二次方程） in your adult life，but the process of learning it may improve you in certain ways you may never think about．
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