He _______ special training on acupuncture . He seems to know everything about this Chinese traditional treatment.
A. should have had
B. must have had
C. could have had
D. would have had
试比较皮亚杰与维果斯基关于心理发展的基本观点,并结合儿童发展与教育进行论述。
()是世界上高速铁路投产运营里程最长、在建规模最大、运行速度最快的国家。
A美国
B德国
C俄罗斯
D中国
世界范围内掀起了高速铁路规划和建设热潮。当前,以()为核心的可持续发展理念已成为全球各国的共识。
A高效、安全、节约
B高效、低碳、节约
C安全、低碳、节约
D安全、高效、低碳