主动脉弓的分支有（）
A.右颈总动脉
B.左颈总动脉
C.冠状动脉
D.肺动脉干
E.右锁骨下动脉
参考答案：B
He will have learned English for eight years by the time he ______ from the university next year.[ ]
A. will graduate
B. will have graduated
C. graduates
D. is to graduate
女，37岁，下腹部不适，MRI检查如图所示，下列说法错误的是（）
A.子宫底部局部隆起，该病灶边界清晰
B.病灶T1WI信号与子宫肌层的信号相同
C.病灶T2WI信号为明显低信号
D.此为子宫粘膜下肌瘤
E.此为子宫浆膜下肌瘤
