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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: it's in the non-underlined part, about 1/2 line from the beginning of the sentence. the first word of the underlined part - the split between "because" and "in..." - is attached to "differ", although there's an intervening prepositional phrase (the one beginning with 'from').
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