问题 选择题

图中需求曲线(D)与供给曲线(S)相交于E点(市场均衡点),PE为均衡价格,QE为均衡数量。据此判断下列变化中能使E点向右上方移动的是

A.需求增加,供给减少,且需求增加的幅度大于供给减少的幅度

B.需求增加,供给增加,且需求增加的幅度小于供给增加的幅度

C.需求减少,供给增加,且需求减少的幅度等于供给增加的幅度

D.需求减少,供给减少,且需求减少的幅度大于供给减少的幅度

答案

答案:A

题目分析:供求影响价格。供过于求时,价格下跌,供不应求时,价格上涨。根据这点知识能够判断当需求增加,供给减少时,由于供不应求会导致价格上涨,“需求量增加的幅度大于供给减少的幅度,在新的供求关系中,仍然是供不应求状态。新的供求平衡点与价格会向右上方移动,A说法正确;选项C会导致供过于求,价格下跌。B、D选项在供求变动方向一致的情况下,需要判断新的供求关系,“需求增加的幅度小于供给增加的幅度”“需求减少的幅度大于供给减少的幅度”都会引起供过于求,导致价格下跌,与题意不符。

单项选择题
单项选择题

When Mary Moore began her high school in 1951, her mother told her, "Be sure and take a typing course so when this show business thing doesn’t work out, you’ll have something to rely on." Mary responded in typical teenage fashion. From that moment on, "the very last thing I ever thought about doing was taking a typing course," she recalls.
The show business thing worked out, of course. In her career, Mary won many awards. Only recently, when she began to write Growing Up Again, did she regret ignoring her morn," I don’t know how to use a computer," she admits.
Unlike her 1995 autobiography, After All, her second book is less about life as an award-winning actress and more about living with diabetes (糖尿病). All the money from the book is intended for the Juvenile Diabetes Research Foundation (JDRF), an organization she serves as international chairman. "I felt there was a need for a book like this," she says. " I didn’t want to lecture, but I wanted other diabetics to know that things get better when we’re self-controlled and do our part in managing the disease."
But she hasn’t always practiced what she teaches. In her book, she describes that awful day, almost 40 years ago, when she received two pieces of life-changing news. First, she had lost the baby she was carrying, and second, tests showed that she had diabetes. In a childlike act, she left the hospital and treated herself to a box of doughnuts (甜甜圈). Years would pass before she realized she had to grow up—again—and take control of her diabetes, not let it control her. Only then did she kick her three-pack-a-day cigarette habit, overcome her addiction to alcohol, and begin to follow a balanced diet.
Although her disease has affected her eyesight and forced her to the sidelines of the dance floor, she refuses to fall into self-pity. "Everybody on earth can ask, ’why me’ about something or other," she insists. "It doesn’t do any good. No one is immune to heartache, pain, and disappointments. Sometimes we can make things better by helping others. I’ve come to realize the importance of that as I’ve grown up this second time. I want to speak out and be as helpful as I can be. \

We can know that before 1995 Mary ______.

A. had two books published
B. received many career awards
C. knew how to use a computer
D. supported the JDRF by writing