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【单选题】
（）判断电流产生磁场的方向是用。A.
右手
B.
左手
C.
定律
D.
楞次定律
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举一反三
【单选题】The Medical Letter group believes antioxidant supplementation
A.
is ineffective in attacking free radicals.
B.
alerts the immune system to the presence of free radicals.
C.
attacks both free radicals and the immune system.
D.
prevents the immune system from responding to free radicals.
【简答题】A group of researchers have discovered a new medical herb，which they have ______ a large number of patients and found to have great healing power． 一组调查人员发现了一种新的草药，他们把它使用在大量的病人身上，发现有很好的疗效。
【单选题】The age of the general practitioner is over. More and more graduates of medical schools tend to ______, that is, to concentrate on limited areas of their profession.
A.
generalize
B.
rationalize
C.
study
D.
specialize
【简答题】早期的迁移理论主要包括形式训练说、___________ 、概括化理论和格式塔关系理论。
【简答题】属于缓释系统避孕药的是
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