社会因素是指社会制度、社会群体、道德规范、国家法律、社会舆论、风俗习惯等社会上的各种各样的环境与事物。()
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In face of patents monopolies on medicine, some poor countries______.
A. justified their production of antiviral drugs
B. have initiated anti-patent arguments recently
C. are forced to produce low-cost antiviral drugs
D. have prepared an affordable therapy for patients
充分认识电子商务的重要作用，完善政策法规环境，加强市场监督，属于电子商务发展的()。
A 快速发展期
B 转型与升级期
C 普及期
D 创新发展期
The author suggests that parrots
A. are as intelligent as lovely children
B. are hardly the most intelligent animal
C. have impressive communication skills
D. are able to answer any questions we ask
一般而言，个体在中等动机强度下活动效率最高，动机过高或过低都会降低活动效率。()
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