耳针治疗口疮可选耳穴（）。
A、心
B、口
C、脾
D、胃
E、三焦
参考答案：A, B, C, D, E
Nowadays, the iron and steel industry ________ the key link in socialist production.[ ]
A. is
B. are
C. was
D. were
泰能中西司他丁为下列哪种酶的抑制剂？（）
A.β-内酰胺酶
B.脱羧酶
C.肾脏脱氢肽酶
D.丙氨酸氨基转移酶
