12月四级作文题目规律【一】
昨天晚上，我写作业的时候，遇到了一个奥数难题：有四种水果，它们千克数的乘积在200~250之间，这些水果最少共有多少千克？我想不出来怎么做，就去问爸爸。爸爸让我自己把题多读几遍，好好它的意思。
我读了几遍，还是不太懂。爸爸没有直接告诉我答案，而是给我提了个问题：两个数的乘积等于20，这样的两个数有几组？哪一组的和最大？哪一组的和最小？
我说：有三组：1和20，2和10，4和5；
第一组的和1+20=21最大；
第二组的和2+10=12较小；
第三组的和4+5=9最小。
爸爸让我找规律，并提示我：是不是两个数差的越大，和越大？差的越小，和越小？
我发现就是这么个规律：差值越大，和越大；差值越小，和越小。
啊！我知道该怎么做了：要想符合乘积在200~250之间，总重量最少这两个条件，四种水果的千克重差值一定要小。
所以，这组数应该是：2、3、5、7；
它们的乘积是：2*3*5*7=210；
它们的和是：2+3+5+7=17。
由于不能确定我的答案是否正确，爸爸又编了个小程序，把乘积在200～250之间的所有数列了一个表，发现我分析的结果是正确的。
同时，我发现这道题还有另一个答案：2、4、5、6（2×4×5×6=240，2+4+5+6=17）；我还发现“差值越大，和越大”这个规律也是正确的。
12月四级作文题目规律【二】
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Different people have different views on_____.Some people think that_____,whereas others aegue that __________.
As far as I am concerned, I agree with the opinion that ___________.For one thing,I firmly believe that ___________.For another,_____________.Just think of________,who/which_______.
Taking all these factors into consideration,we may safely come to the conclusion that______.Only if_______can we _______,just as the saying goes,________________.
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In recent years there have been many reports of ________.It turns a new chapter of _________in China,and will have far-reaching effects in the forthcoming years.
The biggest benefit,in my eyes,is that_______.In addition,_______.Finally,______________.
Apart from the benefits mentioned above,we should also face several unavoidable challenges.In the first place,_____________.In the second place,________.What’s more,_______________.In summary,we should_______________.
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Nowadays more and more ______are commonly and widely used in everyday life,ranging from __________to_____________.
The popularity of _______will have a great influence on ______.On the one hand,_________.On the other hand,__________.
To conclude,____________are just like a double-edged sword.With them we may________.However,one point should be kept in mind that we should make sensible use,always being a master instead of slaving of them.
12月四级作文题目规律【三】
The Role of Mobile Phone in People's Communication
The popularity of smartphones has exerted great influence on the way people communicate, so much so that an increasing number of individuals contend that face-to-face communication is being replaced by texts and images on the mobile phone.
There are more than one angle to consider this phenomenon. On one hand, it is pleasantly acknowledged that smartphones shorten the distance between families and friends. Even people from different sides of the globe can share pictures, feelings and thoughts through various types of apps on the phone, thus building a long-distance connection. On the other hand, as the picture warns us, too much smartphone addiction interferes with people's real-life communication. Statistics show that over 70 percent of face-to-face communication consists of facial expressions and body language, which is why people should stay away from mobile phones when they have the chance to actually talk and communicate with others.
In a word, mobile phones act as an appropriate platform where people can always stay in tough however long the distance is, but a wise man should know when to put down his phone.
