The Israeli farmers who pioneered the revolutionary technology known as drip irrigation weren't trying to solve one of the world's most urgent problems．They were just trying to survive．They lived in the desert，and they didn't have enough water to grow their crops．

    In its simplest form, it was little more than a pipe with holes in it. But behind each hole was a hi-tech dripper that let out just the right amount of water. Snaked along a row of crops so that the holes were positioned directly above the roots, the pipe could direct each precious drop of water directly to the plants, getting a bigger harvest while using a very small amount of the water．

    Over time, the farmers improved upon the technology, perfecting the drippers that regulated the flow of water, and connecting the pipelines to computers that could determine exactly how much water each plant needed and when．

    If the global population kept growing, the rest of the world would increasingly resemble their little community in the desert. So they began selling their irrigation systems in other parts of the world，eventually expanding to more than 110 countries. Netafirm, the company says it's lifting people out of poverty and conserving water at a time when the importance of doing so has never been clearer．

    The mass adoption of drip irrigation won't save the world by itself. To avoid the coming catastrophe, nearly everybody will, in some way, have to do more with less, perhaps through accepting and using other new technologies. Otherwise, it's going to get ugly．

    How do I know if my older computer is worth repairing? There are several things to consider.

    How old is your computer?

    {#blank#}1{#/blank#}So if your computer is older than that, then it may not have suitable hardware to make repairing worthwhile.

    How much are new computers nowadays?

    Now brand name Windows 9 or Windows 10 desktop computers with 8GB Ram, 1TB harddrive and DVD are $500 or less.{#blank#}2{#/blank#}You can find new computers for less, but they may not have a satisfying lifespan of 3-5 years or more.

    {#blank#}3{#/blank#}If you have a computer that you find it hard to get replacement parts, the costs can be high. With that being said, replacing a power supply, video board, cooling fan, or Ram memory chip can be fixed at a fair price{#blank#}4{#/blank#}．

    How long will the repair take?

    You should also consider the time! If the computer is used in your business, the cost downtime(停工期)may be a bigger factor than repair cost.{#blank#}5{#/blank#}Many big computer stores have to send your laptop out for repair which can take 2-3 weeks. For business or home, one consideration might be to buy a new computer and repair the old computer if possible.

A. Where can I buy a new computer?

B. Many business replace computer every 3-5years.

C. Desktop computer repairs will usually be faster laptop repairs.

D. How much is the repair cost?

E. New brand name laptops with the same features(特征)are $600 or less.

F. Is my old broken computer worth repairing or fixing?

G. If you are a do-it-yourself enthusiast, you can cut the cost of labor!

    For thousands of years, we have looked for ways to measure time. Early humans found that the regular movements of the sun, the earth> the moon, and the stars made good ways to measure time. The rising and setting of the sun were used to distinguish (辨别) day from night.

    But, eventually, people needed to tell time more accurately, or exactly. So, by using the sun's position in the sky, they divided the day into dawn, morning, midday and evening.

    Then it was noted that the sun cast a changing shadow as it moved across the sky. Time could be told more accurately by setting up a stick and marking the positions of the sun's shadow. It was the ancient Greeks who divided each position of this “sundial (日晷)” into hours.

    But the sun doesn't always shine. So, for the past 6,000 years, many other ways of keeping time have been tried. Slow-burning candles were divided into hours, and the hourglass was invented. When all the sand in the top of an hourglass has shifted to the bottom, an hour has passed.

    Later, the pendulum (摆钟), with its regular back-and-forth movement of weights, was used to move the hands on a clock. Pendulums are still used in grandfather clocks.

    Today, even more accurate clocks are in use, such as battery-operated quartz clocks (石英钟), digital clocks, and clocks run by electrical tuning forks and tiny atoms. These atomic clocks are the most accurate clocks ever invented. The exact time can be kept to within 1 second a century.

    Do you have a health problem, such as high blood pressure or obesity? Did your doctor tell you that you can improve your condition with better nutrition? Do cancer, heart disease, or diabetes run in your family? {#blank#}1{#/blank#} Meanwhile, you also need to improve your eating habits for better nutrition.

    It can be hard to change your eating habits. However, you are sure to benefit from making changes to your diet if you have diseases that can be made worse by things you are eating or drinking. {#blank#}2{#/blank#}

    Find the strengths and weaknesses in your present diet. Do your eat 4-5 cups of fruits and vegetables every day? Do you get enough calcium（钙）? Do you eat whole grain, high-fiber foods? If so, you're on the right track. Keep it up! {#blank#}3{#/blank#}

    {#blank#}4{#/blank#} If you eat a lot of fat at present, cut back and change your habits. For example, reduce any extra fat. This includes butter on bread, sour cream on baked potatoes, and salad dressings.

    Keep track of your food intake（摄入量）. {#blank#}5{#/blank#} This record will help you assess（评价）your diet. You'll see if you need to eat more or less from certain food groups.

    Think about asking for help from a nutritionist. They can help you follow a special diet, especially if you have a health issue.

A. Cut back on unhealthy fat.

B. Write down what you eat and drink every day.

C. Below are suggestions to improve your health.

D. If not, add more of these foods to your daily diet.

E. You should eat foods that contain vitamins and minerals.

F. If your answer is yes, talk to your doctor about your health.

G. Balanced nutrition and regular exercise are good for your health.

    If you are already making the time to exercise, it is good indeed! With such busy lives, it can be hard to try and find the time to work out. {#blank#}1{#/blank#} Working out in the morning provides additional benefits beyond being physically fit.

    Your productivity is improved. Exercising makes you more awake and ready to handle whatever is ahead of you for the day. {#blank#}2{#/blank#}

    Your metabolism (新陈代谢) gets a head start. {#blank#}3{#/blank#} If you work out in the mornings, then you will be getting the calorie (卡路里) burning benefits for the whole day, not in your sleep.

    {#blank#}4{#/blank#} Studies found that people who woke up early for exercise slept better than those who exercised in the evening. Exercise energizes you, so it is more difficult to relax and have a peaceful sleep when you are very excited.

    {#blank#}5{#/blank#} If you work out bright and early in the morning, you will be more likely to stick to healthy food choices throughout the day. Who would want to ruin their good workout by eating junk food? You will want to continue to focus on positive choices.

There are a lot of benefits to working out, especially in the mornings. Set your alarm clock an hour early and push yourself to work out! You will feel energized all day long.

A. You will stick to your diet.

B. You prefer healthy food to fast food.

C. Your quality of sleep improves.

D. There is no reason you should exercise in the morning.

E. After you exercise, you continue to burn calories throughout the day.

F. You can keep your head clear for 4-10 hours after exercise.

G. If you are planning to do exercise regularly, or you're doing it now, then listen up!

    Lots of people find it hard to get up in the morning, and put the blame on the alarm clock. In fact, the key to easy morning wake-up lies in resetting your body clock.{#blank#}1{#/blank#} Here's how to make one.

    ●{#blank#}2{#/blank#} In order to make a change, you need to decide why it's important. Do you want to get up in time to have breakfast with your family, get in some exercise, or just be better prepared for your day? Once you are clear about your reasons, tell your family or roommates about the change you want to make.

    ●Rethink mornings. Now that you know why you want to wake up, consider re-arranging your morning activities. If you want time to have breakfast with your family, save some time the night before by setting out clothes, shoes, and bags.{#blank#}3{#/blank#} That's a quarter-hour more you could be sleeping if you bought a coffee maker with a timer.

    ●Keep your sleep/wake schedule on weekends. If you're tired out by Friday night, sleeping in on Saturday could sound wonderful. But compensating on the weekends actually feeds into your sleepiness the following week, a recent study found.{#blank#}4{#/blank#}

    ●Keep a record and evaluate it weekly. Keep track of your efforts and write down how you feel. After you've tried a new method for a week, take a look at your record.{#blank#}5{#/blank#} If not, take another look at other methods you could try.

A. Get a sleep specialist.

B. Find the right motivation.

C. A better plan for sleep can help.

D. And consider setting a second alarm.

E. If the steps you take are working, keep it up.

F. Stick to your set bedtime and wake-up time, no matter the day.

G. Reconsider the 15 minutes you spend in line at the cafe to get coffee.