人体必需氨基酸不包括()
A.苯丙氨酸
B.赖氨酸
C.酪氨酸
D.亮氨酸
E.蛋氨酸
参考答案:C
The teacher came into the classroom _______ by his students.
A.following
B.to be following
C.followed
D.having followed.
下列中药材中哪一种是毒性中药()
A.斑蝥
B.土鳖虫
C.僵蚕
D.蝉蜕