单选题
By giving him electrical shock treatment, the doctor has______ a partial cure of his short sightedness.
【正确答案】
B
【答案解析】effect,“实现”、“达到……的目的”,如:The new minister hopes to effect changes in the government's policy.这位新部长希望改变政府的政策。affect,“影响”,如:Smoking affects health.吸烟影响健康。afford,“负担得起”,如:I can't afford three weeks away from work.我无法丢下工作三星期。render:present,offer,“呈递”、“提供”。