The North American moose's long legs enable it to move quickly through the woods, stepping easily over downed trees, but predators pursuing it must leap or go around them.

A、
A. moose's long legs enable it to move quickly through the woods, stepping easily over downed trees, but predators pursuing it must leap or go around them
B、
B. moose's long legs enable it to move quickly through the woods, stepping easily over downed trees while predators pursuing them must leap or go around
C、
C. moose's long legs enable it to move quickly through the woods and to step easily over downed trees, but predators pursuing them must leap over or go around them
D、
D. moose has long legs, enabling it to move quickly through the woods and to step easily over downed trees while predators pursuing them must leap or go around
E、
E. moose has long legs that enable it to move quickly through the woods, stepping easily over downed trees while predators pursuing it must leap over or go around them

答案：E

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问题：这里为什么step和move不是并列结构的呢？因为判断，在树林间快速移动和轻易地跳过倒下的树木，是并列关系，所以一开始就把正确答案排除了查看答疑

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