Most doctors in a recent survey said that annual physical examinations were effective with 【M1】______ detecting illne

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问题     Most doctors in a recent survey said that
annual physical examinations were effective with            【M1】______
detecting illness in apparently healthy patients,
even there is little scientific evidence                    【M2】______
to support the exams.
The report found that physicians are largely unaware that   【M3】______
current federal government guidelines did not recommend annual exams for healthy adults
with symptoms. The study also suggested that
in performing annual physicals many physicians              【M4】______
routinely order screening tests that had not been
proved useful for patients with no symptoms.                【M5】______
Sixty-five percent of 783 physicians who
completed a questionnaire maintained that                   【M6】______
an annual physical was necessary, and 55 percent believed that annual physicals for healthy
adults were recommended by national organizations. The researchers found that even
many a doctors who were aware of
published guidelines continued to perform annual physicals, 【M7】______
because patients wanted them, or because
they believed the procedure gave them the chance            【M8】______
to offer advice about preventive health measures.
Among the physicians, those are younger,                    【M9】______
the women, the gynecologists and those in private practice
were the most inclined ones to favor                        【M10】______
【M8】

选项

答案because改成either

解析 句式结构。这里考察的是“either...of”的搭配,在这里的意思是两个选其一,因此有了后半句的or,就必须要有前半句的either。
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