单项选择题 五四运动以后，陈独秀主编的宣传马克思主义的刊物是（ ）

问答题 Being a developing country，China has made great progress in acquisition and application of science and technology as well as modern knowledge，but compared with developed countries，it still has a long way to go.For this reason，China has decided on the strategy of developing the country through science and education.Now，it is accelerating the progress in science and technology and knowledge update so as to narrow the gap between China and the developed countries.The vitality of knowledge lies in innovation.Only by creating new knowledge and technology unceasingly can the new industrial revolution be triggered and the development of the economy and society be boosted.Only by continuous reformation and innovation in theory and technology，can new invention and breakthrough be made in order to inject new vigor and vitality for economic and social development，in order to effectively develop，arrange and exploit human and natural resources，thereby creating more the material and spiritual wealth for the benefit of human society.

单项选择题 1519年，率领船队作环球试航的葡萄牙人是（ ）