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I recently moved into a new home, and I was disappointed to find that the water pressure was not as high as at my previous house. One of my neighbors told me the problem was hard water—that our water supply contains lots of minerals, like calcium and magnesium. This causes scales to build up in pipes, appliances, fixtures and even the water heater. I had heard that hard water solutions were costly and inconvenient, so I asked him what he’d done about the problem. That’s when he told me about ClearWave, a remarkable water conditioner that helps reduce scale building-up and helps prevent new scales from forming.
An innovative solution. ClearWave uses the latest microprocessor technology to electronically gener- ate inaudible waveforms. They help keep calcium carbonate particles, or scale, dissolved in the water. The water treated by ClearWave continues to dissolve the scale as it flows through the pipes. Over time, it helps solve hard water problems in the entire system, from the water heater and pipes to ap- pliances and shower heads. This will result in a variety of benefits for you and your home. You’ll find yourself using less soap and detergent, and your appliances will operate more efficiently. ClearWave works with all types of pipe and installs easily with ordinary household tools.
No salt, no chemicals, no plumbing. Pure water contains nothing but H20. When it comes out of the ground, however, water is rich in a multitude of minerals, such as calcium and magnesium. In the past, there have been three basic methods used to control the problem of hard water and scale formation. One method is to remove the minerals through ion exchange, using salt. A second method involves adding chemicals, such as phosphates, to the water. Both of these methods change the makeup of the water and require the homeowner to continuously replenish the salts or chemicals—as well as performing periodic maintenance on the equipment. A third method involves using magnets and elec- trostatic devices to cause electrical changes in the water that affects the scaling characteristics of the minerals. This method is similar to that used by ClearWave, with an important difference. The electric field generated by ClearWave is continually applied to the water, while a magnetic field relies on the movement of the water to produce the changes.
ClearWave is a revolutionary new product that solves your home’s hard water problems without salt, chemicals or plumbing.
(From Popular Science)
According to the text, hard water is the water that is full of problems caused by:
According to the text, it is true or false to say that:
The correct sequence is:
Some had given up hope of ever seeing the Hill-Stivers family alive again after they disappeared in the wilderness 17 days ago.
But the family defied amazing odds, and was found Tuesday, safe and sound, in a remote, snowy area of southwestern Oregon. Their chances of survival were so bleak that searchers had given up looking for them, CBS News correspondent Vince Gonzales reports.
They survived, along with the family dog and cat, in their snowbound recreational vehicle by rationing dehydrated food and other provisions.
Their trip started as a vacation. Six members of the Hill-Stivers family — Pete Stivers, 29, Marlo Hill- Stivers, 31, their children Sabastyan, 9, and Gabrayell, 8, and Stiver’s mother and stepfather, Elbert and Becky Higginbotham — began a short journey in an RV more than two weeks ago.
The group left Ashland, Ore., on March 4, setting out across the mountains to the coast, which normally takes a couple of hours. A relative reported them missing March 8, and a desperate search began.
Two adults were found after they left the RV, which had gotten stuck in snow, to seek help. Hours later, rescuers found the others and they were reunited in Glendale, about 80 miles north of the California border.
Later, Peter Stivers and Marlo Hill-Stivers ran up to a van as it pulled into town with the two children and Stivers’ mother and stepfather, Becky and Elbert Higginbotham of Arizona.
According to the text it is incorrect to state that
Which information was not provided in the text?
Read the text.
I USED TO THINK I COULD quit checking my e-mail any time I wanted to, but I stopped kidding my- self years ago. My e-mail program is up and running 24 hours a day, and once I submit to its siren call, whole hours can go missing. I have a friend who recently found herself stuck on a cruise ship near Panama that didn’t offer e-mail, so she chartered a helicopter to take her to the nearest Internet café.
There was nothing in her queue but junk mail and other spam, but she thought the trip was worth it.
I know how she felt. You never know when you’re going to get that note from Uncle Eric about your inheritance. Or that White House dinner invitation with a time-sensitive R.S.V.P.
(TIME, JUNE 10, 2002)
According to the passage, the writer’s friend…
Mark the sentences that are true according to the text.
Read the text and answer the questions:
Smallpox was the first widespread disease to be eliminated by human intervention, In May, 1966, the World Health Organization (WHO), an agency of the United Nations, was authorized to initiate a global campaign to eradicate smallpox. The goal was to eliminate the disease in one decade. At the time, the disease posed a serious threat to people in more than thirty nations. Because similar projects for ma- laria and yellow fever had failed, few believed that smallpox could actually be eradicated, but eleven years after the initial organization of the campaign, no cases were reported in the field.
The strategy was not only to provide mass vaccinations but also to isolate patients with active small- pox in order to contain the spread of the disease and to break the chain of human transmission. Re- wards for reporting smallpox assisted in motivating the public to aid health workers. One by one, each smallpox victim was sought out, removed from contact with others, and treated. At the same time, the entire village where the victim had lived was vaccinated.
By April of 1978, WHO officials announced that they had isolated the last known case of the disease, but health workers continued to search for new cases for two additional years to be completely sure. In May, 1980, a formal statement was made to the global community. Today smallpox is no longer a threat to humanity. Routine vaccinations have been stopped worldwide.
Para atingir o objetivo proposto, a WHO usou da seguinte estratégia:
A leitura do texto permite-nos dizer que
Selecione a alternativa correta.