简述广播媒体的优、缺点。
参考答案:优点:传播面广,速度快,受众广泛,普及率高,制作简单,费用低。
缺点:有声无形,转瞬即逝,不易查存,受众分散,难以把握效果。
根据句意及首字母提示补全单词。
1. You should s____ the table quickly for dinner.
2. Our teachers taught us to sing l____ songs before class.
3. At first, the mother almost went m____ because she lost her daughter.
4. The landlord is so c____ that almost everybody hates him.
5. To our surprise, they made p____ with each other in the end.
腹膜炎病人可因腹腔内积存消化液、血液、尿液及脓液引起腹膜刺激征,其中以()的腹膜刺激最强,()刺激最弱