药物分析主要研究的对象是什么？
参考答案：
化学结构已经明确的合成药物或天然药物及其制剂，中药制剂和生物制品及其制剂。
Questions 11 to 18 are based on the conversation you have just heard.
A．The government has adopted many effective ways to stop pollution.
B．The government can’t prevent pollution completely because of development.
C．There are no effective purifying devices to prevent or stop pollution.
D．The government won’t control pollution even for tile sake of people’s health.
A．+→
B．→+
C．+→
D．→+
+
→
→
+
+
→
→
+
