单项选择题
A．it fails to describe space on a non-local level, complicating attempts to determine the geometrical model of the universe
B．it cannot account for the possibility that the universe may be multiply- connected instead of singly-connected
C．it yields inconsistencies in spatial topology equations, discriminating unnecessarily between the torus and the plane
D．it creates the illusion that observable space is curved, when in fact the universe may be Euclidean and planar
E．it does not provides sufficient variety in geometrical models to describe all the possible ways in which space may curve
单项选择题 The author refers to the illusion of seeing crowds primarily in order to（）
单项选择题 Which of the following best describes the organization of the passage
单项选择题 It can be inferred from the passage that economic theory as it presently stands would most likely apply to which of the following situations（）