_ good knowledge of psychology is essential to __ study

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___ good knowledge of psychology is essential to ____ study of the colors because it can help to mesasure responses___some colors scientifically.
第一空选填A,The,/
第二空选填the,/
第三空选填to,of
都请说明原因,谢谢

A,the,to
有所指的,或前面提到过的用定冠词the,没提到过的,无所指的用不定冠词a
第三个空指对颜色的反应,用介词to

___ good knowledge of psychology is essential to ____ study evolutionary educational psychology is the study of. 1.__ good command of english is essentia to ___ study of bri Psychology is the study of effect of constellation culture o psychology is a study of mind 什么意思? He is one of ___(good) ____(friend) it is good for you to study hard 和 it is good of you to stud 英语翻译最后的they do怎么解？Psychology is the study of the mind and me It is essential that everyone ___ what to do. which is a better place to study psychology?Canada or Austra TV is a good -------(mean) of getting knowledge. 20.All ________ is a good knowledge of English.