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W(xu)W(wng) > иԇ > 俼иxҪc(din)ęC(j)

俼иxҪc(din)ęC(j)

l(f)r(sh)g:2017-06-29݋f

иx俼^(gu)](mi)һc(din)“ęC(j)”Dzе!҂?c)xY}}ȷ涼ҪзмɵM(jn)С@(g)“ęC(j)girl”o]Ďc(din)“ęC(j)ؼ”ȡиx߷֡

ęC(j)һ俼(jng)(yn)ҪW(xu)(hu)Yx{(dio)

F(xin)ڸW(wng)վx俼(jng)(yn)ͼкܶ@Щ(ni)݌(du)҂Ă俼ЎģǴҪW(xu)(hu)YxҪһ(g)EҪW(xu)(hu)(j)ԼČ(sh)HrM(jn){(dio){(dio)֮ǰһҪM(jn)֪Լˮƽ~RZ(y)wϵL(zhng)yֻг˽ԼĆ(wn)}c(din)ᘌ(du)ԵĽb俼(jng)(yn)ԼĂ俼|(zh)

ęC(j)俼YJ(rn)(zhn)TPO

ĕr(sh)g࣬ͲҪ؝İϵY϶^(gu)(li)ֻҪTPO1-48}ȫŪͬW(xu)ҲǿȡÝMijɿ(j)}^(gu)УҪķexxɺʹ}@Щ܎_ʡ

ęC(j)}һԭĞ(j)

иx}һ֌W(xu)ǐ뮔(dng)ȻԼ˼SʽM(jn)x@xĴ𰸺ܶr¶e(cu)`ġСһ(li)һ}Ŀ

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~λһThe 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.f(shu)mass extinctionķ(f)l(f)֧companion star hypothesis@(g)hypothesisf(shu)܉׃Ό(do)һЩwƫx܉ɞEǵԭf(shu)Ҵΰl(f)܉extinctionlB}һҪԭĞ}ȡиx߷

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