What impact can mobile phones have on their users’ health? Many people worry about the supposed ill effects caused by radiation

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问题     What impact can mobile phones have on their users’ health? Many people worry about the supposed ill effects caused by radiation from handsets and base stations, (1)_____ the lack of credible evidence of any harm. But evidence for the beneficial effects of mobile phones on health is rather more (2)_____ Indeed, a systematic review (3)_____ out by Rifat Atun and his colleagues at Imperial College, rounds up 150 (4)_____ of the use of text-messaging in the (5)_____ of health care. These uses (6)_____ three categories: efficiency gains; public-health gains; and direct benefits to patients by (7)_____ text-messaging into treatment regimes.
    Using texting to (8)_____ efficiency is not profound science, but big savings can be achieved. Several (9)_____ carried out in England have found that the use of text-messaging reminders (10)_____ the number of missed appointments with family doctors by 26-39%, and the number of missed hospital appointments by 33-50%. If such schemes were (11)_____ nationally, this would translate (12)_____ annual savings of £256-364 million.
    Text messages can also be a good way to deliver public-health information, particularly to groups (13)_____ are hard to reach by other means. Text messages have been used in India to (14)_____ people about the World Health Organization’s strategy to control lung disease. In Iraq, text messages were used to support a (15)_____ to immunize nearly 5 million children (16)_____ paralysis.
     (17)_____, there are the uses of text-messaging as part of a treatment regime. These involve sending reminders to patients to (18)_____ their medicine, or to encourage accordance with exercise regimes. However, Dr. Rifat notes that the evidence for the effectiveness of such schemes is generally (19)_____, and more quantitative research is (20)_____.


选项 A、called upon
B、switched to
C、rolled out
D、went through

答案C

解析 such schemes在这个条件状语从句中需要补充完整的是such schemes的动作,rolled out的意思是to make a new product available for people to buy or use=launch"推出,推开,发行,启动",如:The company expects to roll out the new software in September.公司打算在九月推出新软件。符合题意。called upon的意思是"号召,呼吁",号召的对象通常是人,而不是such schemes,故不入选。switched to"转向"和went through"经历,仔细检查"均不符合题意。
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