通读下面的短文，掌握其大意。然后，从每小题的四个选项中选出可填入相应空白处的最佳选择。

milk wAs onE oF thE mAin FooDs For pEoplE long BEForE history wAs writtEn. mAyBE {{u}} (21) {{/u}} will rEmAin An importAnt FooD As long As thErE ArE {{u}} (22) {{/u}} thAt givE milk. thE olD worD "milk" {{u}} (23) {{/u}} sAnskrit(梵文), onE oF thE olDEst {{u}} (24) {{/u}} known to mAn.A、vEry olD piCturE oF milking, {{u}} (25) {{/u}} wAs DrAwn FivE thousAnD yEArs Ago, hAs BEEn FounD、 in thE yEArs long Ago, pEoplE got thEir milk {{u}} (26) {{/u}} thEir own AnimAls.But {{u}} (27) {{/u}} moDErn timEs nEw invEntions mADE thE milk inDustry(产业) A Big BusinEss. {{u}} (28) {{/u}} 1851 gAllBorDEn FounD A wAy to {{u}} (29) {{/u}} somE oF thE wAtEr out From milk. this mADE milk kEEp longEr. Four yEArs lAtEr, louis pAstEur {{u}} (30) {{/u}} A wAy to kill thE BACtEriA(细菌) in milk. thEn A spECiAl milk BottlE wAs mADE. this wAs FollowED {{u}} (31) {{/u}} thE invEntion oF mAChinEs thAt CoulD Fill BottlEs with milk. thE DisCovEriEs hAD A grEAt EFFECt(影响) on thE milk inDustry. thEy mEAnt thAt milk CoulD BE kEpt longEr. somE pEoplE BEliEvE thAt milk Drinking will BEComE lEss populAr {{u}} (32) {{/u}} it hAs BEEn.But rEmEmBEr how long milk hAs BEEn An importAnt FooD {{u}} (33) {{/u}} think oF thE mAny wAys {{u}} (34) {{/u}} it is usEFul. it sEEms {{u}} (35) {{/u}} to sAy thAt thE milk inDustry will AlwAys BE importAnt.

A．pEoplE
B．FooDs
C．AnimAls
D．things