Suggestopaedia believes that language learning can occur at a much faster rate than it is often expected if learners can make better use of their______ powers.

用滑轮组提升重物时，承担重物的绳子由两段改为四段，重物被提升的高度保持不变，则拉绳的一端 [ ]

A． 移动的距离不变

B． 移动的距离增大到原来的2倍

C． 移动的距离减少为原来1/2倍

D． 移动的距离增大到原来的4倍