Pioneered by scientists at Los Alamos National Laboratory, BEAM roborts are not programmed to walk; instead they use brainlike circuts called neural networks to learn to walk through trial and error.
A. BEAM robots are not programmed to walk; instead they use brainlike circuits called neural networks to learn to walk through trial and error
B. BEAM robots learn to walk through trial and errorby using brainlike circuits called neural networks instead of by programming them
C. BEAM robots are not being programmed to walk but instead using brainlike circuits called neural networks and learning to walk through trial and error
D. brainlike circuits called neural networks are used instead of programming for BEAM robots learning to walk through trial and error
E. brainlike circuits called neural networks are being used for BEAM robots that learn to walk through trial and error instead of being programmed
在PREP笔记中解释C是说using和are not being并列了，但是为什么不能并列呢？？是因为using主动语态么？但是正确答案Ａ中也是用的they use呀~
