题干

小平和小玲下军棋,用摸扑克牌来决定由谁先出棋。他们选了四张扑克牌,其中两张是红桃,另两张是黑桃。

游戏规则:

※  将四张扑克牌背面朝上,每人摸出一张,第一个摸出一张,记住自己的颜色,再放回,第二个再摸。

※  如果两人摸出的牌颜色相同,则小平先出棋;如果颜色不同则小玲先出棋。请回答下列问题:

(1)摸出两张牌是同样颜色的可能性是几分之几?(   ____      )

(2)摸出两张牌是不同样颜色的可能性是几分之几?(   ____    )

(3)这个游戏规则公平吗?(   ____     )

上一题 下一题 0.0难度 选择题 更新时间:2016-12-29 12:59:47

答案(点此获取答案解析)

二分之一,二分之一,公平

同类题1

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Doctors SayMost Heart Disease Preventable

               Heart disease is the number one killer,worldwide, of men and women over the age of 60. But people of all ages die ofheart attacks each year. And while death rates have declined in the U.S. and many western European countries, they are on the risein the developing world.____ .

          No one would have guessed that Barbara Tengwould have a heart attack. She was not overweight. She did not smoke orexercise. “In 2004,the week after Iturned 49 ,when I was on abusiness trip in Chicago,Ihad a major heart attack,”shesaid.____. She now exercisesdaily, and monitors her heart health.

 Dr. Patrice Nickens, who is with the NationalHeart, Lung and Blood Institute, thinks that heart disease is 82 percentpreventable. “____,” she said.“Men are also facing the same problem, and thekey to staying healthy is knowing your numbers.”

 “Your weight, your blood cholesterol, bloodsugar and your blood pressure are important numbers that can help you takeaction and reduce your risk,”she said.

____.

    “And the steps to take are simple:don't smoke, maintain a healthy weight, exercise, know yournumbers and talk to your physician and control these risks,” she said.

 African­Americans are at higher­than­averagerisk for heart disease and stroke;peopledon't even know they have it, which increases the risk. Medstar WashingtonHospital Center is trying to reach this population.____. For example, helping the peoplemonitor their blood pressure. If people realize they are at risk for heartdisease, they'll make lifestyle changes: lose weight, exercise, eat the rightfoods and keep in touch with a doctor.

a.A healthy lifestyle can prevent heart disease

b.So we must cure heart disease

c.It is the leading cause of death for women

d.With the right training, they can play an important role incommunity health

e.And that changed her life

f.Lack of exercise causes heart attacks

g.Yet most heart disease is preventable