[单项选择]Every year more than half a million American kids have drainage (排泄) tubes surgically implanted in their ears to combat persistent infections. The procedure, known as tympanostomy, may not be as (62) as the tonsillectomy was in the 1940s, but it now (63) as the nation’s leading childhood (64) and a new study suggests it’s being vastly overused. In (65) more than 6,000 scheduled ear tube operations, a team of experts (66) by Harvard pediatrician Lawrence Kleinman found that fewer than half were clearly justified. "Each year", the researchers write in the current Journal of the American Medical Association (JAMA), "several hundred thousand children in the United States may be (67) tympanostomy tubes that offer them no demonstrated (68) ...and may place them at increased (69) ."
Tube placement isn’t a (70) risky procedure, but it costs ＄1,000 to ＄1,500 and sometimes scars the eardrum, causing a partial
A. which
B. whose
C. that
D. who

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[单项选择]Every year more than half a million American kids have drainage(排泄) tubes surgically implanted in their ears to combat persistent infections. The procedure, known as tympanostomy, may not be as (62) as the tonsillectomy was in the 1940s, but it now (63) as the nation’s leading childhood (64) and a new study suggests it’s being vastly overused. In (65) more than 6,000 scheduled ear tube operations, a team of experts (66) by Harvard pediatrician Lawrence Kleinman found that fewer than half were clearly justified. "Each year", the researchers write in the current Journal of the American Medical Association (JAMA), "several hundred thousand children in the United States may be (67) tympanostomy tubes that offer them no demonstrated (68) ...and may place them at increased (69) ."
Tube placement isn’t a (70) risky procedure, but it costs $1,000 to $1,500 and sometimes scars the eardrum, causing a partial loss of (71)

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