人们不喜欢丢掉自己的原有"地盘"，不喜欢丢面子。他们往往陷入一_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

人们不喜欢丢掉自己的原有"地盘"，不喜欢丢面子。他们往往陷入一种思想陷阱，也就是经济学家所说的"沉没成本"，它指一种时间和金钱的投资，只有在产品销售成功后才可顺利回收。在英语国家中，也被称为"将钱掉进排水沟里"。这段文字意在告诉我们( )。

A．很多人有怀旧情绪，不善于放弃

B．所有金钱和时间上的投资都会得到回报

C．计算投资成本时，应该把"沉没成本"也加进去

D．当决定是否进行投资的时候，必须忘掉自己过去的投资

答案

参考答案：A

解析：由"也就是"可以看出本文是用一个经济学上的概念来比喻社会学上的"怀旧"问题，"原有地盘"、"面子"都相当于沉没成本，必须投资出去才可能真正获利，但人们往往因为不能"立即回收"而不愿投资，也就是不善于放弃，故选A。

完形填空

In the doorway of my home, I looked closely at my 23-year-old son, Daniel. In a few hours he would be flying to France to   36 a different life. It was a transitional（过渡的）time in Daniel's life. I wanted to    37  him some words of significance. But nothing came from my lips, and this was not the    38 time I had let such moments pass.
When Daniel was five, I took him to the bus stop on his first day of kindergarten. He asked, “What is it going to be like, Dad? Can I do it?” Then he walked   39  the steps of the bus and disappeared inside. The bus drove away and I said nothing. A decade later, a similar   40 played itself out. I drove him to college. As I started to leave, I tried to think of something to say to give him    41 and confidence as he started this new stage of life. Again, words 42 me.
Now, as I stood before him, I thought of those 43  opportunities. How many times have I let such moments   44 ? I don't find a quiet moment to tell him what they have 45 to me. Or what he might   46  to face in the years ahead. Maybe I thought it was not necessary to say anything.
What does it matter in the course of a lifetime if a father never tells a son what he really thinks of him?    47  as I stood before Daniel, I knew that it did matter. My father and I loved each other. Yet, I always   48  never hearing him put his   49   into words. Now I could feel my palms sweat and my throat tighten. Why is it so   50 to tell a son something from the heart?
My mouth turned dry, and I knew I would be able to get out only a few words clearly. “Daniel,” I said, “If I could have picked, I would have picked you.” That's all I could say. He hugged me. For a moment, the world    51 , and there were just Daniel and me. He was saying something, but tears misted my eyes, and I couldn't understand what he was saying. All I was    52 of was the stubble（短须）on his chin as his face pressed   53  mine. What I had said to Daniel was   54 . It was nothing. And yet, it was 55 .

B．instruction

B．discouraged

B．embarrassing

A．disappeared

判断题

铝酸钠溶液的稳定性与循环母液的苛碱浓度无关，只与循环母液的Aｋ有关。