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ęC(j)}һԭĞ(j)
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According to paragraph 4, what aspect of extinction episodes does the companion-star hypothesis supposedly clarify?
A. Their location
B. Their frequency
C. Their duration
D. Their severity
companion star hypothesisP(gun)I~λһ䣬The possibility that mass extinctions may recur periodically has given rise to such hypotheses as that of a companion star with a long-period orbit deflecting other bodies from their normal orbits, making some of them fall to Earth as meteors and causing widespread devastation upon impact.fmass extinctionķ(f)l(f)֧companion star hypothesis@(g)hypothesisf܉׃Ό(do)һЩwƫx܉ɞEǵԭfҴΰl(f)܉extinctionlB}һҪԭĞ}ȡиx߷