题目:
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.
选项:
A、because they are attached to a cartilage rod at the elbow instead of
B、because of being attached to a cartilage rod at the elbow rather than at
C、in their attachment to a cartilage rod at the elbow instead of being attached at
D、in that they are attached to a cartilage rod at the elbow rather than at
E、in their being attached to a cartilage rod at the elbow instead of
答案:
D