In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

[Q]: Article: Supply and demand is perhaps one of the most basic concepts of economics and it is the backbone of a market economy. Demand refers to how much of a product or service is desired by buyers. The quantity demanded is the amount of a product people are willing to buy at a certain price; the relationship between price and quantity demanded is known as the demand relationship. Supply represents how much the market can offer. The quantity supplied refers to the amount of a certain goods producers are willing to supply when receiving a certain price. The relationship between price and how much of a goods or service is supplied to the market is known as the supply relationship. Price, therefore, is a reflection of supply and demand.    The law of demand states that, if all other factors remain equal, the higher the price of a product, the fewer people will demand that product. The amount of goods that buyers purchase at a higher price is less as the price of a product goes up, so does the opportunity cost of buying that product.    Like the law of demand, the law of supply shows the quantities that will be sold at a certain price. But unlike the law of demand, the supply relationship shows an upward slope. This means that the higher the price, the higher the quantity supplied. Producers supply more at a higher price because selling a higher quantity at a higher price increases the whole income.    Now that we know the laws of supply and demand, let's turn to an example to show how supply and demand affect price.    Imagine that a CD of your favorite band is sold for $20. Because the record company's previous analysis showed that consumers will not demand CDs at a price higher than $20, only ten CDs were sold because the opportunity cost is too high for suppliers to produce more. If, however, the ten CDs are demanded by 20 people, the price will then rise. As a result, the rise in price should cause more CDs to be supplied as the supply relationship shows that the higher the price, the higher the quantity supplied. If, however, there are 30 CDs produced and demand is still at 20, the price will not be pushed up because the supply is more than the demand. 
 Question: We know from the passage that changes in the prices of product cause changes in   _  . 
 Options: (A) income and expense (B) invention and production (C) market and society (D) supply and demand
[A]: D


[Q]: Article: I  learned a  long  time ago  that hair has meanings--plenty of meanings. Growing up  in  the 1960s, my friends and I struggled without parents' control over the length and style of our hair. At  the  time,  hair  represented  our  need  to  break  free  from  adults  in  our  lives.  Long  hair represented our freed inner selves. My clients are often surprised when I asked them questions about their hairstyle--why they choose it, how else they've worn their hair, how they feel about it, and so on. However, while it may  seem  to  be  a  simple  topic,  even  today  our  hairstyles  still  have many  psychological  and emotional meanings. Understanding some of those meanings can lead to understanding of many different aspects of a person's mind. How we view our hair,  for example, can show something about how we view ourselves. Our  hair  can  show  physical  and  emotional wellbeing,  desirability,  and  even  social  and financial  status. When  it  becomes  dull  or  fragile,  it  can  communicate  emotional  and  physical diseases. But hair can also show unrecognized and often unspoken daydreams about oneself and one's world. One woman--a successful professional--wore her long hair in a thick bun . But  one  day  she  showed me  that  tangled  hair was kept  in  the bun. She  said  that  she never brushed out the tangles because the hair showed her secret image of herself as a helpless, disturbed woman, like Ophelia in the play Hamlet. Another woman came to therapy in a huge shirt and huge pants that she believed they could hide the weight she had put on since the birth of her child. She talked about how much she hated her  body  and  how  helpless  she  felt  about  doing  anything  about  it.  But  her  hair  was  always beautifully  coloured  and  decorated. When  I  pointed  out  that  she  seemed  to  have  a  different relationship with her hair  from she did with her body, she said  that her hair had been  thinning and  that she was  trying  to make  it  look as good as she  could.  I pointed out  that what she was doing  with  her  hair  and  her  body  was  kind  of  contradictory,  and  wondered  if  she  had  any thoughts about that. She was surprised. But as we talked about her contradictory attitudes towards different parts of her physical self, we began to open up all sorts of other thoughts and ideas about her inner self. And interestingly, as we continued opening those internal doors, changes started to happen. She started eating differently and exercising  regularly. One day some months  later, she appeared  in my  office  in  skinny  jeans  and  a  tight  sweater,  and  her  hair was  pulled  back  in  a  ponytail.  "I decided to see what would happen if I stopped trying to hide myself, " she said with a big smile. "And...?  "  I  asked.  "People  keep  smiling  at  me  in  the  street. My  husband  hugged  me  this morning for the first time in ages. And I feel good! " Besides, selfrespect in both men and women can be damaged by thinning hair;they may feel  alone  even  though  they  are  really  not. Given  our  cultural  focus  on  physical  appearance, youth, and health, hair loss can be unpleasant for both men and women. The market is filled with hairenhancing  treatments, but  there  are  those who  have decided  to be  against  the  system  and change to the "bald is beautiful" position. But it is much harder for women to take the "bald is beautiful" approach to hair loss. We tend to try to hide it in one way or another. But no matter what approach you use, it is important to remember that the thickness of your hair  has  nothing  to  do with  your  value  in  the world. Remember  that  you  have  nothing  to  be ashamed of if you have thinning hair. Thinning hair may not be something you can change, but it doesn't have to control how you represent the person who lives underneath it. 
 Question: In the 1960s, long hair represented  _  . 
 Options: (A) fashion (B) honesty (C) peace (D) freedom
[A]: D


[Q]: Article: When I arrived in Beijing more than five years ago, I had already given blood 79 times. I wanted to continue to be a donor and asked around if there was a Red Cross clinic in Beijing. There was one, and I went. I was very surprised to be received as a hero; for me, a blood donation was simply a good habit and a gift of love to Humanity. In Canada, donors can give 450ml each time every 51 days. That means six times a year. In China, we can give only 200ml, every four months. In 1984, there were only 19 donors in Beijing who offered their blood for free. One year later, there were 141. In 1986, 1,083, and so on until the figure reached 10,046 in 1990,14,016 in 1992 and more than double that the following year. There were 41,037 in 1994, and my statistics stop here. I'm so glad to see that the Chinese have understood that giving blood is not dangerous, and that it's a way to say, in a real communist spirit, "brother, I love you". In fact, every time I give blood, I think of my blood running in a man or a woman's veins, someone who has become my brother or my sister through a transfusion. Thirteen Chinese have become my  s now; isn't that great? Giving blood is like giving birth. Some of these thirteen people may have died without my donation; doesn't that make it worth becoming a volunteer? What makes me even happier is when I can convince a Chinese friend to come with me and become a donor too. 
 Question: Up till now, how many times have the author given blood? 
 Options: (A) 79 (B) 51 (C) 13 (D) 92
[A]:
D


