“关爱生命，拥抱健康”是人类永恒的主题．下列说法科学的是（ ）
A．在白酒中添加塑化剂可提高白酒的品质
B．用地沟油烹制食品可降低成本
C．食盐加碘可防止甲状腺肿大
D．在生猪饲料中添加瘦肉精可提高瘦肉的产量
A、塑化剂对人体有害，所以不能在白酒中添加塑化剂来提高白酒的品质，故A错误；
B、地沟油中含有致癌物质，所以不能用地沟油烹制食品，故B错误；
C、碘元素是人体所需的元素，食盐加碘可防止甲状腺肿大，故C正确；
D、瘦肉精对人体有害，所以不能在生猪饲料中添加瘦肉精，故D错误．
故选：C．
The ancient Greeks were very good at making conversations, and the greatest talker of them all was philosopher Socrates. His pupil, Plato, recorded some of his supposed conversations, and we read them in ‘ The dialogues' of Plato. In many classrooms today, Socrates' method of teaching is used. 小题2:____________________ The best talkers appear to have a great interest in and love for their fellow creatures; a curiosity about the world in general; some powers of observation and reflection; respect for their own opinions and tolerance for those of others; and quick thinking. And they talked for the fun of it, not to show off their knowledge. 小题3:____________________ A good voice must have the help of good speech, whose two assistants are clear enunciation (清晰发音)and correct pronunciation. Poor enunciation may suggest to your listeners that you lack consideration, and that you are not especially concerned about their opinion of you. 小题4:___________________ Pronunciation is settled by common agreement of the community or group speaking the particular language or dialect. For standard pronunciation of words, a dictionary is your best friend. The usage of words is somewhat the same as pronunciation. To be accurate in your use of words is very important in your conversation. Dictionaries usually provide the usage of words. So whenever you meet with new words, it is a good idea to look them up in the dictionary. 小题5:____________________ Think of meeting a stranger as a chance to have a good time to talk, to make a friend. Look with a smile directly into the other’s eyes when you are intructed, and shake hands with a firm, friendly clasp. This will give you confidence. Then try to have a smooth and pleasant conversation with him. |