第二部分　完成句子　(25分)
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Some　psychologists　(心理学家)　maintain　that　mental　acts　such　as　thinking　are　not　performed　in　the　brain　alone,　but　that　one's　muscles　also　participate　(参加).　It　may　be　said　that　we　think　with　our　muscles　in　somewhat　the　same　way　that　we　listen　to　music　without　bodies.
You　surely　are　not　surprised　to　be　told　that　to　music　not　only　with　your　ears　but　with　your　whole　body.　Few　people　can　listen　to　music　that　is　more　or　less　familiar　without　moving　their　body　or　more　specifically　(具体地),　some　part　of　their　body.　Often　when　one　listens　to　a　concert　on　the　radio,　he　is　tempted　to　direct　the　orchestra　(管弦乐队)　even　though　knows　where　to　direct　the　orchestra　even　though　he　knows　there　is　an　able　conductor　on　the　job.
Strange　as　this　behavior　may　be,　there　is　a　very　good　reason　for　it.　One　cannot　derive　all　possible　enjoyment　form　music　unless　he　participates,　so　to　speak,　in　its　performance.　The　listener　"feels"　himself　into　the　music　with　more　or　less　pronounced　motions　of　his　body.
The　muscles　of　the　body　actually　participate　(参加)　in　the　mental　process　of　thinking　in　the　same　way,　but　this　participation　is　less　obvious　because　it　is　less　pronounced.
16.　Some　psychologists　believe　that　thinking　is　performed　not　only　by　one's　brain　but　also　one's　_________.

17.　The　process　of　thinking　and　that　of　listening　are　similar　in　that　muscles　________　in　both　processes.

18.　_________　people　are　able　to　listen　to　familiar　music　without　moving　some　part　of　their　body.

19.　Body　movement　are　necessary　in　order　for　the　listener　to　________　the　music　fully.

20.　According　to　the　passage,　muscle　participation　in　the　process　of　thinking　is　not　readily　a_______.