50+____=58 6+____=15 11-____=9 ____-8=8
63-____=60 13-____=6 39-____=30 20+____=20
下列是脊椎动物的一组是( )
①水蛭 ②蛔虫 ③海马 ④涡虫 ⑤蚯蚓 ⑥蝾螈 ⑦避役 ⑧虾.
小腿和足的相连部位称为( )
一 What do you think of the new movie?
— To tell you the truth, I think it's boring.