更多"For the first time in decades, rese"的相关试题:
[单项选择]For the first time in decades, researchers are reporting a significant drop worldwide in the number of women dying each year from pregnancy and childbirth, to about 342,900 in 2008 from 526,300 in 1980.
The findings, published in the medical journal The Lancet, challenge the prevailing view of maternal mortality as an intractable problem that has defied every effort to solve it. "The overall message, for the first time in a generation, is one of persistent and welcome progress," the journal’s editor, Dr. Richard Horton, wrote in a comment accompanying the article, published online on Monday. The study cited a number of reasons for the improvement, lower pregnancy rates in some countries; higher income, which improves nutrition and access to health care; more education for women; and the increasing availability of "skilled attendants"—people with some medical training—to help women give birth. Improvements in large countries like India and China helped to drive down the ov
A. resisted
B. eluded
C. challenged
D. denied
[简答题]
For the first time in decades, doctors have begun making major changes in the treatment of lung cancer, based on research proving that chemotherapy can significantly lengthen life for many patients for whom it was previously thought to be useless.
The shift in care applies to about 50,000 people a year in the United States who have early cases of the most common form of the disease, non-small-cell lung cancer, and whose tumors are removed by surgery. (46) Many of these patients, who just a few years ago would have been treated with surgery alone, are now being given chemotherapy as well, just as it is routinely given after surgery for breast or colon (结肠)cancer. The new approach has brightened a picture that was often bleak.
"The benefit is at least as good, and maybe better than in the other cancers," said Dr. John Minna, a lung cancer expert and research director at the University of Texas Southwestern Medical Center in Dallas. He said new disco
[单项选择]For decades, researchers have grappled with the problem of creating a machine that can tell, definitively, whether a person is lying. Until recently, their work has been far from successful. The past generation of lie-detection technologies has been put under scientific scrutiny and found wanting. But science, ever resourceful, is coming up with new ideas.
The problem with past lie detectors is that it relies on second-hand signs of lying, such as a person’s breathing rate, pulse, blood pressure which a good actor can suppress. Furthermore, someone who is telling the truth might exhibit just these signals, because the very act of being questioned by the authorities is stressful. Instead, current research is looking directly at the source of lies, the brain itself.
Daniel Langleben uses a brain-scanning technique called functional magnetic-resonance imaging to probe his subjects’ honesty. The lie which those subjects are asked to tell is a small one: they have to persua
A. the principles of past lie-detection machines
B. why past lie-detection machines did not work
C. why it is necessary to develop new lie-detection machines
D. the difference between past and present lie-detection machines
