A study found that the radiation from CT scans—the tests regularly used to(1

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问题 A study found that the radiation from CT scans—the tests regularly used to(1)_____ internal injuries or signs of cancer—is likely(2)_____ for 2 percent of cancer cases in the United States.
(3)_____ lots of Americans undergo CT scans, that research is unlikely to(4)_____ in doctors’ offices: Two-thirds of patients in a new JAMA study reported(5)_____ nothing of the risks of the diagnostic procedure.(6)_____, 17 percent felt like they played an active role in a discussion(7)______, whether this diagnostic test was the best path forward.
"Our study indicates that most decisions to undergo outpatient CT are(8)_____ by physicians and risk communication is(9)______," a team of researchers led by University of Colorado’s Tanner Caverly writes. "The risk communication that took place had limited(10)______: respondents who recalled discussing the benefits and risks of imaging did not have better(11)_____."
Would a conversation about the(12)_____ risks have made a difference? Caverly’s team asked a few other questions(13)_____ suggest it would: Patients undergoing the scan have little idea about the radiation(14)_____. One-quarter self-identified radiation as a risk of a CT scan; 37 percent were able to identify CT scans as having a higher level of radiation(15)_____ a chest x-ray.
There’s a growing movement in medicine right now to(16)_____ on unnecessary treatment or (17)_____ of care. Much of this has been led by a group called Choosing Wisely, which has(18)_____ with dozens of medical societies to come up with lists of (19)_____ that doctors themselves don’t think they ought to be using.
One of their key messages is that more care isn’t necessarily better; all medicine comes with some level of risk. That message does not,(20)______, seem to be delivered in the doctor’s offices studied here. [br] (15)

选项 A、that
B、than
C、which
D、as

答案 B

解析根据空格前的higher，可确定此处选than。

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