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【单选题】
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
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【单选题】What does the word "sophisticated" mean in the sentence "Her extensive social experience is what makes her so sophisticated".
A.
尖端的
B.
老练的
C.
复杂的
D.
精密的