问题 解答题

温 * * 爷爷在接受《华盛顿邮报》记者采访时曾经说过:“13亿,是一个很大的数字,如果你用乘法来算,一个很小的问题,乘13亿,都会变成一个大问题.如果你用除法的话,一个很大的总量,除以13亿,都会变成一个小的数目.”

(1)我国淡水资源总量是2.8万亿立方米,位居世界前列,但人均水资源只有______万立方米(保留两位小数),在世界排名位于100位之后,是全球人均水资源最贫乏的13个国家之一.

(2)为了维持生命,每人每天约需2.5升水,13亿人每天约需______亿升水.

(3)据调查,一个没拧紧的水龙头每分钟漏水100克.1小时、1天、1月(按30天算)、1年(按365天算)分别浪费多少水?

(4)研究表明:一个人除了正常的饮食外,每天应饮水1200克才能维持人体需要.一个没拧紧的水龙头1年漏掉的水,大约可供一个人饮用多少年?(保留整数)

答案

(1)13亿=1300000000,2.8万亿立方米=2800000000000立方米,

2800000000000÷1300000000≈2153.85立方米≈0.22万立方米,

答:人均水资源只有0.22万立方米;

(2)13×2.5=32.5(亿升)

答:13亿人每天约用32.5亿升水;

(3)1小时=60分钟,1天=24小时,1月=30天,1年=12月

100×60=6000(克)=6千克

6×24=14.4千克

14.4×30=432(千克)

432×12=5184(千克)

答:一个没拧紧的水龙头每分钟漏水100克.1小时浪费6千克水,1天浪费14.4千克水,1月(按30天算)浪费432千克水,1年(按365天算)浪费5184千克水;

(4)1200克=1.2千克

5184÷1.2=4320(年)

答:一个没拧紧的水龙头1年漏掉的水,大约可供一个人饮用4320年.

故答案为:0.22;32.5.

阅读理解
阅读下面短文,根据所读内容,在文章后小题的空格里填入一个最恰当的单词。
Blood donation, also called blood banking, is a wonderful thing to do. It is an easy and direct way of making a contribution to social work and having a big effect on the community. It helps to save lives and helps those who are in need of blood because of bad conditions or the heavy loss of blood during operations or in accidents.

You are able to give or donate blood every three or four months. The doctors say it is not bad for your health. It is such a beautiful way of making a huge difference to someone’s life and you can always be proud of it if you make a valuable contribution to society. Blood donation is not a big problem, but you need to keep a few points in mind.
Before donating blood, make sure that the ferrum(铁) level in your body is high enough and for that you should take a healthy diet. Do not go for blood donation with an empty stomach. You should follow the correct process so that everything goes well. After having a balanced diet you will feel strong and comfortable to donate blood. You will not feel weak at the same time.
For required hemoglobin(血红蛋白) in your body, drink lots of juice and other drinks. Fruit juice, such as apple juice is very good for increasing the blood level in your body.
For a good blood flow(血流) in your body, drink at least 6-7 glasses of water every day. Completely avoid taking alcohol or caffeine a day before and after giving blood. Do not smoke cigarettes(烟) half an hour before giving blood.
When you are going for blood donation, be relaxed, which helps keep the right blood pressure(血压). During the blood donation activity, you can breathe deeply and try to calm yourself down. Don’t take part in some other activities.
When you donate blood, you are making the effort to save someone’s life. Blood donation is a very simple and fast process, but you need to take care of yourself after donating blood. Proper care helps to reduce side effects. The following are a few tips that will help you out.
Take a rest for 15 minutes after completion of the donation. It helps you to feel relaxed and energetic.
Eat something and drink juice before leaving the blood donation center. Make sure that you have meals after donating blood. Smoking should be prevented for one hour after the process. Don’t join in some activities at once, for example, driving.
Finally, be proud of yourself because you have done a great thing in helping to save someone’s life. Blood donation is a very important activity.
Title
Blood donation— an important activity
The      小题1:    
of blood donation
Making contributions to   小题2:  work and the community.
Helping those people who suffer the     小题3:   of blood.
Before the donation
Take a healthy diet for a     小题4:    ferrum level.
Drink fruit juice for enough hemoglobin.
Drink at least 6-7 glasses of water a day for a good blood flow.
Avoid taking alcohol and    小题5:  cigarettes.
Never take     小题6:   in other activities.
During the donation
Relax and take a     小题7:  breath.
After the donation
Take a rest.
Don’t forget meals.
Don’t smoke      小题8:    one hour later after the process.
Never join in some activities     小题9:    .
Giving yourself a sense of    小题10:    of it after making a valuable contribution to society.
单项选择题