D. To introduce the history of dirt.

　　D.

　　A popular saying goes, "Sticks and stones may break my bones, but words will never hurt me." However, that's not really true. Words have the power to build us up or knock us down. It doesn't matter if the words come from someone else' or ourselves—the positive and negative effects are just as lasting.

　　We all talk to ourselves sometimes. We're usually too shy to admit it, though. In fact, more and more experts believe talking to ourselves out loud is a healthy habit.

　　This "self-talk" helps us encourage ourselves, remember things, solve problems, and calm ourselves down. Be aware, though, that as much as 77% of self-talk tends to be negative. So in order to stay positive, we should only speak words of encouragement to ourselves. We should also be quick to give ourselves a pat on the back. The next time you finish a project, do well in a test, or finally clean your room, join me in saying "Good job!"!

　　Often, words come out of our mouths without thinking about the effect they will have. But we should be aware that our words cause certain responses in others. For example, when returning an item to a store, we might use warm, friendly language during the exchange. And the clerk will probably respond in a similar manner Or harsh (刻薄的)and critical language will most likely cause the clerk to be defensive.

　　Words have power because of their lasting effect. Many of us regret something we once said. And we remember unkind words said to us! Before speaking, we should always ask ourselves: Is it loving? Is it needed? If what we want to say doesn't pass this test, then it's better left unsaid.

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