—Do you know that Mrs. Obama came to China with her mother and two daughters?

—Yes. And it is their ______ visit to China.

A．one

B．first

C．the first

D．once

使眼球向正前方突出的肿瘤多位于眼眶哪个间隙()

A．骨膜外间隙

B．肌锥外间隙

C．肌锥内间隙

D．眼球筋膜与巩膜之间隙

E．眼球内