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6.C【解析】限据开背勒第三定律有=解得T=3.18√3,18≈5.67年，A、B错误；根据牛预第二定馆可知GMm=ma,“樊锦诗星”在远日点的加速度与地球的加速度大小之比为整r鱼=，a地r层4.86，C正确，D错误。7.C【解析】当二者速度相等时，小物块m沿滑块M上滑的高度最大，设最大高度为h,系统水平方向动量守恒，以,的方向为正方向，有m三(m十M)u,根据机械能守恒可知，，m8二，2(m+M)v2+mgh,解得h=1.2m,A、B错误；设小物块m返回滑块M的底端时，小物块m与滑块M的速度分别为v1、v2,系统水平方向动量守恒，有m,一m十M:,根据机械能守恒定律有mv=)m2=2muf+2Ma5,解得0=-3w=-2m/s,y=弓w=4m/,2根据动量定理，合力对滑块M的冲量大小为I=Mo2一0=8N·s,C正确，D错误。
Fromtheageoffive,AlisonMbekeani,nowinDurhamUniversityforherPhD,dreamedofbecomingascientist.Butbecomingamothertotwochildrenputabrakeonhercareer.Shedoesnotexpecttoreturtothelabuntilherchildrenare16.Dr.Mbekeaniisnotalone.Onesurveyin2019foundthatchild-careresponsibilitiesled2fmherwithachildunder14toreducetheirworkinghourcomparedwithjust5%offathers.Inanidealworld,thegovernmentwouldnothavetoworryaboutanyofthis.Basedontheirpreferences,parentswouldmakeajudgmentoverwhethertooutsource(child-careorkeepitin-house.Thequestionforpolicymakersiswhetherparentalbehaviorreflectsactualpreferencesoritisdrivenbyconstraints()Constraintsareanissue.Threeinfivenonworkingmotherssaythattheywouldprefertowork,giventherightchild-care.Familieshadtoforkoutanaverageof260aweekin2021for50hoursofnurserycareforachildundertwo.Atenthofhouseholdswithachildunderfivereportdifficultymeetingsuchcosts.Aswellasprice,availabilityisaproblem.Just68%oflocalauthoritiesinEnglandreporthavingenoughchild-careprovisiontoserveparentswhoworkfulltime.Besideschild-care,thebenefitsthatcouldflowfromeveningoutthegender)imbalanceinchild-carecouldalsobeprettylarge.Onerecentstudyestimatedthegainsfromshufflingmenandwomenaccordingtoability,pullingproductivewomenintoworkandkickingunproductivemenout.Astonishingly,itwascalculatedthatBritain'saverageoutputperworkercouldbeasmuchas30%higher.Cheaperchild-careandgender-balancedresponsibilityinitarewaysouttohelpmumsintowork,butpolicieswouldneedtobedesignedtotargetreallyconstrainedparents.However,expertsalsoaddthatgivingchildrenthebeststartinlifemeansshorter,structureddaysfullofinteraction.28.WhyisthestoryofAlisonmentioned?A.Toconfirmanidea.B.Todeveloptheplot.C.Todrawaconclusion.D.Tointroducethetopic.29.Whatisthegovernment'skeyfocusaboutchild-careproblem?A.Theinfluenceofparents'finaldecision.B.Thedifferenceofchildren'spreference.C.ThebalanceofresponsibilitytodohouseworkD.Theconsistencyofparentalbehaviorandactualliking.高三大联考·英语第6页（共12页）
