Walk down the drinks section at the supermarket.Look in the drink cooler in your local convenience store.A new drink is taking up more and more space on the shelves，and that drink is water.Bottled water sales in the US rose to 1.7 billion gallons in 2010 for plastic bottles alone，compared to total sales of only 700 million gallons in 1990. Whereas bottled water was once associated only with the rich and the privileged (特权阶层)，it is now regularly drunk by people at all income levels despite the fact that the price of bottled water can be between 240 and 10,000 times higher per gallon than tap water.What accounts for this surprising increase in demand?

    Traditionally，people have drunk bottled water for health reasons.The practice of “taking the waters” originated with the Romans，who believed that a person developed a healthy mind by building a healthy body.Across Europe，drinking or bathing in mineral water has been associated with the power to cure various diseases.Health spas at Evian in France and Pellegrino in Italy began bottling water so that their consumers could continue their treatments at home.The consumers in the 21st century are also concerned about health.However，in America，where the habit of drinking bottled water is relatively new，the concern is often more related to the purity or sterilization (消毒) of the water than to its mineral contents.Americans are often worried about the effects of the chemical pollution and other contaminants on the water supply.Many Americans view bottled water as a safe alternative to tap water.

    Further reasons for drinking bottled water are its usefulness as an aid to digestion，as a complement to a good meal in a restaurant，and for taste.City tap water is often treated with chlorine (氯) to guard against harmful micro­organisms.Chlorine，as well as metals from pipes and tanks used to distribute and store tap water，can leave behind an unpleasant taste.

    William Campbell, Satoshi Omura and Tu Youyou jointly won the 2015 Nobel Prize for medicine their work against parasitic diseases (寄生虫病). 85-year-old Tu was awarded this prize for her contribution to (reduce) the death rate of malaria (疟疾), minimizing patients' suffering and promoting mankind's health. This is science is all about.

    As a matter of fact, Tu has won some attention when she (get) the Lasker Award in 2011. But there is no way to compare her popularity back to the attention she is receiving today. As the first Chinese mainland Nobel Prize Winner of natural science award, Tu's winning (complete) surprised Chinese people, have long been wondering when the first Chinese Nobel Laureate in natural science would appear.

    Tu Youyou is the first Chinese scientist to win a Nobel Prize for work (carry) out within China. She has spent 40 years' time on scientific research. Although the Nobel Prize did not come to her until four decades later, it is definitely one of most privilege rewards that recognizes Tu's devotion and perseverance in discovering artemisinin (青蒿素). Her record-breaking winning   (be) a reminder that science is never about instant success. There is no way to measure how much you spend on scientific research and compare with how much reward you get.

iPads vs. Textbooks

    What if you could have your whole backpack at the touch of your fingertips? In the first month of the Apple iPads release, 25million were sold! People all over the world use iPads for all sorts of different things, but one of their finest qualities is the ability to be a textbook.

    To begin with, iPad are less expensive. Textbooks become outdated and schools have to buy new books, but with an iPad schools can update them for free. Schools don't have to spend $500 every year for iPads because they last a while and can be updated.

    Students usually have multiple classes, which results in multiple textbooks. Heavy backpacks filled with books can cause back problem. A solution to that is an iPad, which only weighs 1.33 pounds and can hold all of a student's textbooks.

    Third, schools should get rid of their textbooks and get iPads because they have more capabilities. Some might think all of the apps are distracting, but the apps actually make iPads more efficient. Textbooks cannot do those tasks, but iPads can easily do them with just a tap of the fingertip.

    Lastly, iPads are a better choice for schools instead of textbooks because these devices allow students to access their learning anywhere at any time. With iPads, they find it easier to get their homework done.

    In conclusion, schools should get rid of their clumsy textbooks and switch to iPads. iPads have allowed this generation to have their entire backpack in the palm of their hands.

These tablets are perfect for busy students.

B. Second, iPads cost less and are more popular.

C. Therefore, they can use the saved money for other programs.

D. iPads have already replaced textbooks in over 600 American counties.

E. Moreover, in high school, textbooks have an average of 4.8 pounds each.

F. Schools have every reason to do away with their school books and switch to iPads.

G. iPads absorb the need to buy calculators, dictionaries, and other items that are found within the device.