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[单选题]The Klondike was the scene of one of the biggest gold rushes the world has ever known.

location

[单选题]Goethe often did outdoor skating and swimming.

根据下列材料，请回答下面的题目Look After Your VoiceOften speakers, at a meeting experience dry mouths and ask for a glass of water. You can solve the problem by activating the saliva in your mouth. First gently bite the edges of your tongue with your teeth. Or, press your entire tongue to the bottom of your mouth and hold it there until the saliva flows. Or you can imagine that you are Slicing a big juicy lemon and sucking the juice.Before you begin your talk, be kind to your voice, Avoid milk or creamy drinks which dry your throat. Keep your throat wet by drinking a little sweetened warm tea or diluted fruit juice.If you sense that you are losing your voice, stop talking completely. In the meantime, do not even talk in a low voice. Save your voice for your health. You may feel foolish using paper to write notes, but the best thing you can do is to rest your voice. If it is necessary , perhaps you can get some advice from a professional singer.What about drinking alcohol to wet your throat? I advice you not to touch alcohol before speaking. The problem with alcohol is that one drink gives you a little confidence. The second drink gives you even more confidence. Finally you will feel all-powerful and you will feel you can do everything, but in fact your brain and your mouth do not work together properly. Save the alcohol until after you finish speaking.Perhaps you want to accept the advice, but you may wonder if you can ever change the habits of a lifetime. Of course you can. Goethe, who lived before indoor skating rinks or swimming　pools, said, "We learn to skate in the summer and swim in the winter". Take this message to heart and give yourself time to develop your new habits. If you are willing to change, you will soon be able to say that you will never forget these techniques because they became a part of your body.To solve the problem of dry mouths, one is advised to take cool milk.

Not mentioned

解析：文章没有提及。

[单选题]The earthquake that hit the eastern half of the United States two centuries ago is the biggest“mid—plate”one in history．

根据以下资料，回答下面的题目。 Oklahoma is an area often experiencing natural disasters．

not mention

解析：题意：200多年前袭击美国东半部的地震是最大的板块中间类型的地震。文中并未提及200多年前袭击美国东半部的地震是最大的板块中间类型的地震。故选C。