问题 单项选择题

某花店的进货价只有低于正常价格时,才能以低于市场的价格卖花而获利;除非该花店的销售量很大,否则,不能从花农那里购得低于正常价格的花;要想有大的销售量,该花店就要满足消费者个人兴趣或者拥有特定品种的独家销售权。如果上述断定为真,则以下哪项必定为真

A.如果该花店从花农那里购得低于正常价格的花,那么就会以低于市场的价格卖花获利

B.如果该花店没有以低于市场的价格卖花而获利,则一定没有从花农那里购得低于正常价格的花

C.该花店不仅满足了消费者的个人兴趣,而且拥有特定品种独家销售权,但仍然不能以低于市场的价格卖花而获利

D.如果该花店以低于市场价格卖花而获利,那么进货价一定低于正常价格

答案

参考答案:D

解析:【解析】本题答案为D。令p表示"该花店从花农那里购得低于正常价格的花",q表示"该花店以低于市场的价格卖花而获利",r表示"该花店的销售量很大",s表示"该花店满足消费者个人兴趣",t表示"该花店拥有特定品种的独家销售权"。题干作了如下断定:(1)只有p,才q(即:如果非p,则非q);(2)除非r,否则非p(即:如果非r,则非p);(3)如果r,则s或者t。由断定(1),可直接得:如果q,则p。即"如果该花店以低于市场价格卖花而获利,那么一定是从花农那里购得了低于正常价格的花"。这正是D项所断定的。其余各项均不能从题干的断定推出。

解答题
阅读理解

阅读理解。

    Everyone has good days and bad days. Sometimes, you feel as if you're on top of the

world. But occasionally you feel horrible, and you lose things and you cannot focus on

your schoolwork. For more than 20 years, scientists have suggested that high self-esteem

(自尊) is the key to success. Now, new research shows that focusing just on building self-

esteem may not be helpful. In some cases, having high self-esteem can bring bad results

if it makes you less likeable or more upset when you fail at something.

    "Forget about self-esteem," says Jennifer Crocker, a psychologist (心理学家) at the

University of Michigan, US. "It's not the important thing."

    Feeling good

    Crocker's advice may sound a bit strange because it is good to feel good about

yourself.

    Studies show that people with high self-esteem are less likely to be depressed,

anxious, shy, or lonely than those with low self-esteem.

    But, after reviewing about 18,000 studies on self-esteem, Roy Baumeister, a

psychologist at Florida State University, has found that building up your self-esteem

will not necessarily make you a better person.

    He believes that violent and wicked people often have the highest self-esteem of

all. He also said:"There's no evidence that kids with high self-esteem do better in

school."

    Problems

    All types of people have problems. People with high self-esteem can have big egos

(自我) that can make them less likeable to their peers (同龄人), said Kathleen Vohs,

a psychology professor at Columbia University.

    People with high self-esteem tend to think more of themselves, Vohs says. People

with low self-esteem are more likely to rely on their friends when they need help.

    What to do

    Researchers say it is best to listen to and support other people. Find positive

ways to contribute to society. If you fail at something try to learn from the experience.

"The best therapy (药方) is to recognize your faults," Vohs says. "It's OK to say, 'I'm

not so good at that,' and then move on."

1. The new research comes to the conclusion that high self-esteem ______. [ ]

A. is not important at all

B. has taken on a different meaning

C. may not be the key to success

D. does not help you do better at school

2. One of the conclusions of the new research is that ______. [ ]

A. feeling good about oneself doesn't mean you lead a happier life

B. people with high esteem usually do not seek other's help

C. people with high esteem tend to be proud

D. people with low esteem are often more popular

3. The underlined part "a better person" in the passage probably means a person who is

   ______. [ ]

A. helpful and supportive

B. gentle and modest

C. likable and successful

D. friendly and kind

4. From the text, we can infer the best therapy mentioned in the last paragraph is mainly

   for people ______. [ ]

A. with high self-esteem

B. with low self-esteem

C. of all kinds

D. who are focusing on building self-esteem