blood flows in a human body is a question not ever

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____ blood flows in a human body is a question ____ not everyone can understand fully.
为什么填HOw , that?

这是一个主语从句,How blood flows in a human body作整个句子的主语,血液怎样在人体里流动,所以用how（怎样）,第二个空用that,that引导的又一个定语从句,修饰前面的question.
再问： please 翻译完整~
再答：血液怎样在人体里流动是一个并非所有人都能完全理解的问题。

____ blood flows in a human body is a question ____ not ever 1、( ) medicine works in a human body is a question ( ) not e 1.（How ） medicine works in a human body is a question（that ） Human life is everywhere a ____ in which much is to be endur It is well know ____ a person eats cause changes in the body To be or not to be,____ is a question可不可以填it It is not ____ to discuss the question again and again.A.wor This is not ____(we) classroom.____(our) is in Building A the teacher asked Ben ____ a difficult question in class. 1.Please answer my question in a ____ voice There Is ____ egg in the box.A.No B.not a C.not.为什么? WHETHER to clone human being or not is a moral question rath