| When researchers come up with a new
treatment that makes us feel or work better, it’s usually not just the truly
sick who end up going in for an upgrade. The progress in developing treatments
for illnesses that ravage memory and thought raises an important question: might
the same tools be used to improve the functioning of minds that by most
standards are already running fairly smoothly We may well be approaching an era
of designer brains, in which those of us feeling a little foggy or dull can have
our IQ, fast recall, and self-confidence inflated up via the prescription pad.
"Some brain-related conditions we think of as ordinary, "says one researcher,
"may eventually become disorders, too"—including perhaps less-than-razor-sharp
thinking. The notion of a prescription IQ lift is hardly new. According to polls, about one in 2 A. It effectively cures attention-deficit disorder and narcolepsy. B. It should be legally obtained on prescription. C. It helps to improve attention and memory problems. D. It may potentially lead to addiction problems. [填空题]According to the passage all water pollutants come from household waste.
[填空题]From this passage we may come to the conclusion that the 18th century saw ______.
[单项选择]Passage One
A. Go through a health check. B. Carry little luggage. C. Arrive early for boarding. D. Undergo security checks. [单项选择]Passage Two
Do you go to bed without brushing your teeth You may think that not brushing is not a big deal. But caring for your mouth can prevent serious (and even embarrassing) problems.
Cavities happen to just about everyone. A cavity is a diseased spot in the tooth. It all starts with a sticky film made up of bacteria. That film coats your teeth and gums. The bacteria eat sugars from things you eat and drink. That produces acids. Then, the acids eat away at your teeth’s hard outer coating, called enamel.
If you don’t brush regularly to remove the film, or if you keep missing a spot, those acids keep eating away the teeth’s enamel. That is how you get a cavity. "The larger it gets, the closer it gets to the nerve, increasing the chance of severe pain," says Lynn Ramer, president of the American Dentists’ Association.
A cavity will never just go away by itself. It will only get worse. "Left untreated, 100 percent of the time a cavity will spread," says Dr.
A. a mix of silver and resin B. a metal blend containing glass C. a metal blend containing copper D. a mix of glass and resin 我来回答: 提交
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