此类作文主要是针对某个问题或现象做出解释并说明原因，最后提出相应的解决方案。
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The whole society should pay close attention to the problem of ______________. Its results may be ______________________. It will also bring the changes to our society such as ____________________.
When we think about it, we find three constructive solutions. First, ____________________. Second, ______________________________. And finally, __________________________. Then we will find ______________________________.
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It is reported that we are facing__________________________.
There are two basic sources of these problems. One is man-made, for example, ____________________. The other is a natural catastrophe.______________________________.
Then how should we _____________________________? One method is ____________________. Or perhaps _____________________is a better way to ________________. In addition, __________________________________________. Only in these ways can we embrace a brighter future.
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No doubt, everyone wishes to __________________________. When we discuss this, some fundamental principles should be brought in mind.
The first key factor to solve this problem is _________________________. __________is another key factor __________________________. But the two methods may bring us some side effects, for example, _____________________. Of course, the most effective way to solve the problem is that ____________________________. But the conditions are not yet met.
All in all, the solutions may not bring the perfect result, but as long as we do it with our brains and hands, we will one day solve it.
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More and more attention has been focused on the problem of ____________________________.
It brings not only ____________________, but also _______________________. But the most serious result of the problem is _____________________. If the problem is not settled down, _________________________________.
The suggestion we can make to the problem is _____________________________. In that case, __________________________________.
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