题干

彩电按原价格销售,每台获利60元;现在降价销售,结果彩电销售量增加一倍,获得的总利润增加了0.5倍,则每台彩电降价了(  )元。


A:5  

B:10 

C:15 

D:20

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答案(点此获取答案解析)

C

同类题1

    One day, I went to see my last patient(病人), an old woman. In the doorway, I saw she was struggling (挣扎) to put socks on her swollen (浮肿)feet in the bed. I stepped in, spoke quickly to the nurse, read her chart noting. I was almost in the clear that she was not in serious condition.
I asked, “Could I help put on your socks? How are you feeling? Your sugars and blood pressure were high but they’re better today. The nurse mentioned you’re anxious to see your son. He’s visiting you today. It’s nice to have a family visit. I think you really look forward to seeing him."
    "Sit down, doctor. This is my story, not yours." She said with a serious voice.
I was surprised as I helped her with the socks. She told me that her only son lived around the corner from her, but she had not seen him in five years. She believed that was the main cause of her health problems. After hearing her story and putting on her socks, I asked if there was anything else I could do for her. She shook her head no and smiled. All she wanted me to do was to listen.
    Each story is different. Some are detailed; others are simple. Some have a beginning, middle and end; others don’t have clear ends. Some are true; others not. Yet all those things do not really matter. What matters to the storyteller is that the story is heard — without interruption(打断) or judgment(评价).
    It was that woman who taught me the importance of stopping, sitting down and truly listening. And, not long after, in an unexpected accident, I became a patient. 20 years later, I sit all the time — in a wheelchair.
For as long as I could, I continued to see patients from my chair. I believe in the power of listening.

同类题3

读历史故事,感人物精神。
        【甲】宫中府中,俱为一体,陟罚臧否,不宜异同。若有作奸犯科及为忠善者,宜付有司论其刑赏,以昭陛下平明之理,不宜偏私,使内外异法也。
侍中侍郎郭攸之、费祎、董允等,此皆良实,志虑忠纯,是以先帝简拔以遗陛下。愚以为宫中之事,事无大小,悉以咨之,然后施行,必能裨补阙漏,有所广益。
       将军向宠,性行淑均,晓畅军事,试用于昔日,先帝称之曰能,是以众议举宠为督。愚以为营中之事,悉以咨之,必能使行阵和睦,优劣得所。
       亲贤臣,远小人,此先汉所以兴隆也;亲小人,远贤臣,此后汉所以倾颓也。先帝在时,每与臣论此事,未尝不叹息痛恨于桓、灵也。侍中、尚书、长史、参军,此悉贞良死节之臣,愿陛下亲之信之,则汉室之隆,可计日而待也。
        【乙】郗超与谢玄①不善。苻坚②将问晋鼎③,既已狼噬梁、岐④,又虎视淮阴⑤矣。于是朝议遣玄北讨,朝间颇有异同之论。唯超曰:“是必济事。吾昔尝与之共在桓宣武⑥府,见其使才皆尽,虽履屐之间⑦,亦得其任。以此推之,其必能立勋。”大功既举人咸叹超之先觉又重其不以爱憎匿善。
      【注释】①郗(xī)超、谢玄:均为东晋大臣。 ②苻(fú)坚:十六国时前秦国主,在淝水之战中被东晋打败。③问晋鼎:图谋夺取晋朝天下。④梁、岐:地名。⑤淮阴:淮河以南地区。⑥桓宣武:即桓温,东晋征西大将军。⑦履屐之间:距离很小,此处指小事。