The art of movement is among the oldest of the arts，which is not ________ surprising, for so much about us is in perpetual motion.
A. really
B. reality
C. real
D. realist
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In many ways, this is unfortunate for the poor actors who are required to go ________ repeating the same lines night after night.
A. in
B. to
C. on
D. with
汽车上普遍采用低压__________V直流电源为整车供电。（填一个数字）
通常只用一根导线连接电源正极和用电器，电源负极端则由车体的金属部分代替而构成回路。这种连接方式称为_______。（3个字）
______是指将电能转化为其他形式能的元器件或设备。如照明灯、扬声器等。（2个字）
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