搜题请搜索小程序“爱下问搜题”
问题 选择题

1842年，魏源在《海国图志》中提出“师夷长技以制夷”的思想，这里的“长技”指的是（ ）

A．汽车制造技术

B．蒸汽机车制造技术

C．电话制造技术

D．内燃机制造技术

答案

答案：B

题目分析：1842年为第一次工业革命时期，主张学习的是蒸汽机制造技术。故选B。ACD三项都19世纪70年代第二次工业革命的成果，与材料所给时间不符。

点评：解答此题的关键在于准确把握两次工业革命的成果。与此相关的支持点如林则徐、魏源的开眼看世界的思潮等需要掌握。

多项选择题

根的中柱鞘细胞具有潜在的分生能力，可产生（）

A.侧根

B.部分形成层

C.木栓形成层

D.不定芽

E.不定根
查看答案
单项选择题

Watch a baby between six and nine months old, and you will observe the basic concepts of geometry being learned. Once the baby has mastered the idea that space is three-dimensional, it reached out and begins grasping various kinds of objects. It is then, from perhaps nine to fifteen months, that the concepts of sets and numbers are formed. So far, so good. But now an ominous development takes place. The nerve fibers in the brain insulate themselves in such a way that the baby begins to hear sounds very precisely. Soon it picks up language, and it is then brought into direct communication with adults. From this point on, it is usually downhill all the way for mathematics, because the child now becomes exposed to all the nonsense words and beliefs of the community into which it has been so unfortunate as to have been born. Nature having done very well by the child to this point, having permitted it the luxury of thinking for itself for eighteen months, now abandons it to the arbitrary conventions and beliefs of society. But at least the child knows something of geometry and numbers, and it will always retain some memory of the early happy days, no matter what vicissitudes it may suffer later on. The main reservoir of mathematical talent in any society is thus possessed by children who are about two years old, children who have just learned to speak fluently.

The word " vicissitude" (in boldface) in the context means().

A. change

B. transformation

C. variation

D. the rubs and worries of life
查看答案