first: consisit of 根据朗文“to be made up由。。。组成,无被动,ex:the city of new york consisits of five boroughs.纽约由五个行政区组成。” 所以题中的they consist 错误
至于伴随状语prep101题The electronics company has unveiled what it claims to be the world's smallest network digital camcorder, the length of which is that of a handheld computer, and it weighs less than 11 ounces
E选项is the world's smallest network digital camcorder, the length of which is that of a handheld computer, weighing的错误原因是E. the length of A is the length of B,错误同A;weighing的逻辑主语为the length of camcorder,逻辑错误。所以伴随状语应该是就近修饰名词。(天呐?这是在说什么?晕乎哉!)