问题 解答题

小明同学看到路边上有人设摊玩“有奖掷币”游戏,规则是:交2元钱可以玩一次掷硬币游戏,每次同时掷两枚硬币,如果出现两枚硬币正面朝上,奖金5元;如果是其它情况,则没有奖金(每枚硬币落地只有正面朝上和反面朝上两种情况),小明拿不定主意究竟是玩还是不玩,请同学们帮帮忙!

(1)求出中奖的概率;

(2)如果有100人,每人玩一次这种游戏,大约有_______人中奖,奖金共约是_______元;设摊者约获利________元;

(3)通过以上“有奖”游戏,你从中可得到什么启示?

答案

解:(1)

(2)25,125,75;

(3)获奖的概率较低,小明同学还是要三思而后行,最好还是不要去玩,如果是国家严令禁止的赌博行为,我们还应该及时举报,让有关部门予以取缔,(答案不唯一)。

阅读理解与欣赏
阅读理解

阅读理解。

     Sometimes, people are not clear about what kind of food is healthy and what kind of food may do harm

to our health. The USDA has prepared a food guide to help people learn about which kind of food is the

healthiest to eat. The food guide describes six main food groups: meat ( like fish and chicken), dairy ( like

milk and cheese),grains (like bread and rice),fruit, and vegetables. The last group is fats and sweets. The

USDA also suggests how much of each food group is healthy to eat daily. Though this guide was prepared

by the US government, it is very useful for people all over the world.

     (1) As a result of years of study, we know that too much animal fat is bad for our health. For example,

Americans eat a lot of meat and only a small amount (量) of grains, fruit and vegetables. Because of the way

they eat, they have a high rate (率) of cancer and heart disease. In Japan, people eat large amounts of grains

and very little meat. The Japanese also have a very low rate of cancer and heart disease. The Japanese live

longer than anyone else in the world. However, when Japanese people move to the US, the rate of heart disease

and cancer goes up as their eating habit changes. And as hamburgers, ice creams and other high-fat foods

become popular in Japan, the rate of heart disease and cancer is going up there as well. (2) People are also

eating more meat and dairy food in other countries, in those countries the disease rate is going up with the

change of people's eating habit. Doctors everywhere suggest people eat more grains, fruit and vegetables and

less meat and dairy food.

     (3) Eating healthily is important for children as well as their parents. When parents have poor eating habits,

their children usually do, too. After all, children eat the same way as their parents. When parents eat healthy

food, the children will learn to enjoy it, too. Then they will develop good eating habits. Doctors suggest parents

give their children healthier food such as fruit, vegetables and juice.

     Everyone wants to live a long, healthy life. We know that the food we eat affects (影响) us in different

ways. For example, doctors believe that fruit and vegetables can really protect people from many different

diseases. On the other hand, animal fat can cause (引起) diseases. We can change our eating habits now and

enjoy many years of healthy living.

1. 将(1)处的句子翻译成汉语。

    ___________________________________________ 

2. 将(2)处的句子改写为含定语从句的句子。 

    ___________________________________________ 

3. 将(3)处的句子改写成同义句。 

    ___________________________________________