请教蓝皮两道语法题part2-87，88

87.although it claims to delve into political issues,television can be superficial such as when each of the three major networks broadcast exactly te same statement from a political candidate.

答案是：superficial,as when the three major networks each

(请翻译一下，另外，为什么不能选superficial whenever each of the three major netwoks)

88.since the 1930's aircraft manufacturers have tried to build airplanes with frictionless wings,shaped so smoothly and perfectly that the air passing over them would not become turbulent.

答案是：wings,wings so smooth and so perfectly shaped 请解释下啊 呵呵 谢谢！

第一题，两个考点

1：such as+N

2:each of us is/ We each are  因为后面是broadcast，直接排除each of形式，when还是whenever都不需要考虑

第二题：

wings， wings...同位语的形式，因为这题 smooth 和 perfectly 修饰的对象不同，所以需要重复前面的名词避免歧义

wings， wings...同位语的形式，因为这题 smooth 和 perfectly 修饰的对象不同，所以需要重复前面的名词避免歧义

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thx!

真没想到修饰的不是同一个。。。