现存最早的针灸学文献是（）。
A.《足臂十一脉灸经》
B.《阴阳十一脉灸经》
C.《难经》
D.《黄帝内经》
E.《针灸甲乙经》
参考答案：A, B
She's aiming ________ a scholarship. That is why she has been focusing her mind ________ her work.
A．at; on
B．to; on
C．for; in
D．at; into
下列哪项不是真正的肿瘤？（）
A.霍奇金淋巴瘤
B.白血病
C.结核瘤
D.Ewing’s瘤
E.黑色素瘤
