When a patient is suspected of having a concussion, or brain injury, doctors often turn to computed tomography, or CT, scans to find out for sure. In a CT scan, a series of X-rays is taken. Each one shows an individual "slice" of the brain, and they can be combined to form a complete three-dimensional picture. Because of the amount of radiation patients are exposed to, however, doctors question the use of the scans, especially for children. Now researchers have proposed an alternative way of diagnosing head injuries: a simple blood test. The test detects proteins that burst out of brain cells into the bloodstream immediately after an injury. It allows doctors to determine whether a patient has suffered head trauma and needs further treatment. What is the main idea of the passage?

can you give some possible answers

disrespectable. hope that

many were disgusted, nauseated and shook their heads with disapproval upon finding out about the recycling of water process. however, they do not seem to understand that this process actually saves water.

although individuals may argue that it is unhealthy, and or unsafe to drink water that is "from toilet to tap" , the water is 100% safe to drink and involves forcing the water across a membrane, which "removes   any impurities, including viruses, pharmaceuticals and dissolved minerals" , according to paul rozin, a psychology professor who studies revulsion.

i agree that that the thought of drinking water that once ran through someones kitchen sink isn't quite appealing, but recycled wastewater is safe to drink. it also saves water. "the city produces nine million gallons a day" claims russell schreiber, the city’s director of public works.

recycled waste water has absolutely no health concerns whatsoever. when wastewater goes into a system, it's absorbed back into the ground. thus, it goes into a sewer system, then goes through a treatment process that removes contaminants before being released. nonetheless, there is no problem in drinking water that has been recycled.

"in drought-ed california, there are six state agencies that use wastewater that comes from an intellectual property source," according to the university of california, riverside. studies show that this water is completely safe to drink, however, it still doesn't mean people are going to happily pour it in a water glass.

researchers hope it "may make consumers more amenable to drinking recycled wastewater," extraordinarily, women who have a higher "disgust reaction" and make most consumer purchasing decisions.