Hi, I'm John. There are four seasons in a year. I like them all. In spring, it's warm. There are pretty flowers everywhere. I often go on a picnic with my parents. Summer is hot. I often go swimming in the pool. I like to wear my sunglasses. In fall, the weather is cool. I can help my grandpa pick apples. Winter is white. I can make a snowman. And I can go skating, too.

百位的左边是____位，右边是____位。

关节既牢固又灵活，与此功能特点无关的是

龙卷风的实质是高速旋转的气流，它能“吸入”地面上的任何物体或者人并“卷向”空中，它能“吸”起物体的原因是（   ）

人们总是选择在适宜居住的环境定居。下列国家中，人们往往选择在地势较高的地区居住的是（　　）