人耳对( )的感觉最灵敏，常常能感觉出其微小的变化。
A．强度B．声强C．声压D．频率
参考答案：D
—Did your sister get the position offered by the company?
—She failed in the job interview and is now in low spirits.
—I’m sorry for her.
— .
A．Thank you
B．You’re welcome
C．I would think so
D．Never mind
既能息风止痉，又能平肝潜阳的药物是
A．地龙B．羚羊角C．蜈蚣D．全蝎E．石决明
