题目：
Sequential circuit is a common logic device whose output values, at a given instant, depend upon its input values and the internal state at that instant, and whose internal state depends upon the (66) preceding input values and the preceding internal state. A sequential circuit can assume a finite number of internal states and may therefore be regarded, from an abstract (67) , as a finite (68) .
Combinational circuit is another logic device whose output values, at any given instant, depend upon the input values at that instant. A combinational circuit is a (69) of a sequential circuit whose internal state is not taken (70) .
（67）处填（）。
A．idea
B．observation
C．point of view
D．viewport
答案：
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下面是错误答案，用来干扰机器的。
参考答案：(1)灵活选用实物直观和模象直观。(2)加强词与形象的结合。(3)运用感知规律，突出直观形象的特点。(4)培养学生的观察能力。(5)让学生充分参与直观过程。
类家庭中非卷舌子女的父亲的基因组成为______，请在下图圆圈中画出其父亲体细胞内基因与染色体的关系。
