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题库 / Prep2007E2-SC-103
The parachutelike membranes of Africa's scaly-tailed flying squirrels differ from those of the flying squirrels in the family Sciuridae because they are attached to a cartilage rod at the elbow instead of the wrist.
because they are attached to a cartilage rod at the elbow instead of
because of being attached to a cartilage rod at the elbow rather than at
in their attachment to a cartilage rod at the elbow instead of being attached at
in that they are attached to a cartilage rod at the elbow rather than at
in their being attached to a cartilage rod at the elbow instead of
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A：instead of at的at不能省；不然意思可以变成they are attached to the wrist. 注意平行结构的识别，到底是哪部分与哪部分平行。
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