My uncle is a teacher .He is a  1 man, about 25 years old. He is tall 2  black short hair. He is a very humorous(幽默的) person. He teaches us Chinese. He often  3 us jokes(笑话) and 4to make our class more   5 . In class, he is a very  6  teacher. If we 7  listen to him carefully, he will 8 us some punishment(惩罚) by 9  us some questions.10  after class, he becomes a very good  11 of us. He 12 talks with the girls and plays 13 with the boys.14 of us really like him. He is our 15 teacher.

下列命题中的假命题是（    ）

维生素C和食盐都是人体所需要的重要物质。下列说法正确的是(  )。