题干

掷一枚骰子,前5次朝上的点数恰好是1~5,则第6次朝上的点数(    )。

A:一定是6   

B:是6的可能性大于1~5中的任意一个数的可能性

C:是6的可能性等于1~5中的任意一个数的可能性

上一题 下一题 0.0难度 选择题 更新时间:2018-12-05 08:57:17

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C

同类题3

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    Women are friendly.But men are more competitive.Why? Researchers have found it's all down to the hormone oxytocin (荷尔蒙催生素).Although known as the love hormone, it affects the sexes differently.

"Women tend to be social in their behavior.They often share with others.But men lend to be competitive.They are trying to improve their social status," said Professor Ryan.

    Generally, people believe that the hormone oxytocin is let out in our body in various social situations and our body creates a large amount of it during positive social interactions (互动) such as falling in love or giving birth.

But in a previous experiment Professor Ryan found that the hormone is also let out in our body during negative social interactions such as envy.

    Further researches showed that in men the hormone oxytocin improves the ability to recognize competitive relationships, but in women it raises the ability to recognize friendship.

Professor Ryan's recent experiment used 62 men and women aged 20 to 37.Half of the participants(参与者)received oxytocin.The other half received placebo (安慰剂).

    After a week, the two groups switched with participants.They went through the same procedure with the other material.

    Following each treatment, they were shown some video pictures with different social interactions.Then they were asked to analyze the relationships by answering some questions.The questions were about telling friendship from competition.And their answers should be based on gestures, body language and facial expressions.

    The results indicated that, after treatment with oxytocin, men's ability to correctly recognize competitive relationships improved, but in women it was the ability to correctly recognize friendship that got better.

    Professor Ryan thus concluded: "Our experiment proves that the hormone oxytocin can raise people's abilities to better distinguish different social interactions.And the behavior differences between men and women are caused by biological factors (因素) that are mainly hormonal."

同类题4

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    “Most children,” Asher Svidensky says, “are a little afraid of golden eagles. However, Kazakh boys in western Mongolia start learning how to use the huge birds to hunt for foxes and hares at the age of 13.” Svidensky, a photographer and travel writer, shot five boys learning the skill as well as the girl, Ashol Pan. “To see her with the eagle was amazing,” he recalls. “She was a lot more comfortable with it, a lot more powerful with it and a lot more at ease with it.”

    The Kazakhs in western Mongolia are the only people that hunt with golden eagles, and today there are around 400 practising eagle hunters. Ashol Pan, the daughter of a famous hunter, may well be the country's only girl hunter.

    They hunt in winter, when the temperatures can drop to -40℃. A hunt begins with days of traveling on horseback through a snow mountain or ridge (山脉) giving an excellent view of prey for miles around. Hunters generally work in teams. After a fox is discovered, riders rush to frighten it into the open, and an eagle is released (释放). If the eagle fails to make a kill, another is released.

     “The skill of hunting with eagles,” Svidensky says, “lies in bringing an unexpected force of nature under control. You don't really control the eagle. You can try and make her hunt an animal, and then it's a matter of nature. What will the eagle do? Will she make it? How will you get her back afterwards?”

    Svidensky describes Ashol Pan as a smiling, sweet and shy girl. “Ashol Pan stands for something about Mongolia in the 21st century,” says Svidensky. “Everything there is going to change and is going to be redefined (重新定义), and the possibility is amazing.”