长期给寒凉药,引起动物机体的变化是()
A.心率加快
B.惊厥阈值升高
C.脑内兴奋性神经递质含量升高
D.痛阈值降低
E.机体甲状腺激素水平升高
参考答案:B
As the wedding ceremony is drawing near, Miss Lin has showed _______ of such worry and fear as sleeplessness and poor appetite.
A.symbols
B.signs
C.marks
D.signals
实体