He ____ been afraid of dogs ____ ____ since his dad kept a pet dog.
围绕"生活的变化"这个话题，李华所在的英语社团对其成员进行了一次调查。下面是李华填写的调查表，请你根据表格内容写一篇80词左右的英语短文，介绍李华生活的变化。
In the past
Now
liked fast food
likes healthy food
didn't like sports
likes sports
took a bus to school
walks to school
often ill
in excellent condition
下列地区是世界人口稠密地区的是
已知X元素的某种同位素的氯化物XCln为离子化合物，在该化合物中X元素的微粒的核内中子数为m，核外电子数为y，则该同位素的符号是（ ）
