您好!只要做以下“完形填空”的第49题,第51题,第54题.这3题,请说明理由.

您好!只要做以下“完形填空”的第49题,第51题,第54题.这3题,请说明理由.
Some people are right-handed and some are left-handed.46 knows the reason why a person becomes right-handed or left-handed.It is not true that it is caused by the 47 in which his parents educate him.In other words,a person is 48 to be right-handed or left-handed.Moreover,the left-handed and the right-handed “think” differently.49 use the hand you’re not 50 can be very upsetting.
One day I tried an experiment:51 hands while eating rice with chopsticks.Being a right-hander,I hoped it would not be too 52 _ for me to take the food with my left hand.Soon after I started,I realized I didn’t know what I was 53 .So I moved in front of a big mirror,in order that I could observe
my 54 clearly.Looking at myself in the mirror,I found I looked 55 a man who had 56 used chopsticks.I grew more and more nervous and finally I had to 57
My experience shows,being 58 to use the hand one is not used to affects a person’s mind.So we should not try to change a left-hander to a right-hander.Some people still think 59 is bad,but luckily this idea is 60 .
( ) 46.A.No one B.Somebody C.The scientist D.One’s parent
( ) 47.A.plan B.way C.skill D.rule
( ) 48.A.taught B.born C.asked D.made
( ) 49.A.Need to B.Forced to C.Having to D.In order to
( ) 50.A.fond B.interested in C.eager to D.used to
( ) 51.A.changing B.using C.holding D.watching
( ) 52.A.harmful B.hard C.tired D.disappointing
( ) 53.A.eating B.watching C.doing D.holding
( ) 54.A.face B.chopsticks C.right hand D.actions
( ) 55.A.for B.like C.through D.after
( ) 56.A.always B.often C.usually D.never
( ) 57.A.give it up B.give it in C.give it out D.give it off
( ) 58.A.able B.unable C.forced D.willing
( ) 59.A.being left-handed B.being right-handed
C.using one hand D.using either hand
( ) 60.A.changing B.not changing
C.never changed D.difficult to change
第49题中的B ,C 貌似都可以。如何取舍？第54题“观察”行为，就这样看啊。要用镜子，只能是看“脸”了。所以选：A