关于甲氨蝶呤,下列哪点不正确:
A.用大量叶酸可减轻骨髓毒性
B.抑制二氢叶酸还原酶发挥抗肿瘤作用
C.可致肝肾损害
D.有致畸作用
E.对儿童急性白血病和绒癌疗效好
参考答案:A
I felt bad _________ I talked about my unlucky experience to the public.
A. for the first time
B. the first time
C. in the first time
D.on the first time
什么叫“锋”?