Do you see the sea? The sea is blue，and it is very large(大的)．The sea looks beautiful in a sunny day. If(如果)you swim，in the sea，you know that the water is salty(咸的)．Do you like the sea?
画一条长6cm的线。
青春期是指由儿童逐渐发育成为成年人的过渡时期。下列关于青春期的叙述，不正确的是（ ）
①血缘关系 ②地缘关系 ③业缘关系 ④亲子关系
