单项选择题

The primary function of the passage as a whole is to

A． indicate the direction that research into a particular physical phenomenon should take
B． illustrate the limitations of applying mathematics to complicated astrophysical phenomena
C． clarify the differences between an old explanation of a physical phenomenon and a new model of it
D． introduce a new explanation of a physical phenomenon
E． explain the difference between two related physical phenomena

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单项选择题

According to the explanation given in the passage, which of the following causes superbubbles to gradually assume the shape of a chimney

A． The gravitational attraction of supernovas adjacent to the region of the chimney's formation
B． The effect of entropy on the relative abundance of hot interior gas within the superbubble
C． A chemical reaction involving ionized trace ions at the heart of the superbubble
D． A tendency toward coalescence in the gases that contribute to the formation of the superbubble
E． A natural buoyancy of the superbubble, which causes the chimney to stretch and become a gaseous conduit

单项选择题

The author of the passage believes that the Neuromancer trilogy would have been improved had Gibson

A． chosen to focus less on the limits on the traditional view of the body as a laboring device
B． treated in greater depth the epistemological systems of laborers whom he admires
C． represented alternative models of labor without qualifying them with costs
D． used characters who succeed in realizing how they are marked by machinery
E． elaborated more fully concerning the models of labor that are dominant over his current models