单项选择题
With computers doubling in speed and power every couple of years, and with genetic engineering’s dazzling feats growing more and more routine, the battered American faith in technological progress has been growing stronger and giddier of late.
单项选择题 治疗口角炎、舌炎等
单项选择题 治疗脚气病及多发性神经炎等
单项选择题 治疗佝偻病、骨软化病和老年骨质疏松症
