日本发展经济的有利条件是（  ）

C

    One of the easiest ways to keep fit is to do jogging. Jogging is the name for a very gentle(舒缓的) running-it is just a little faster than walking.

    Start slow joging 20 meters , then walk 20 meters. Little by little , if you are not feeling very tired , you may do more jogging and less walking . Finally , jog the whole way . It will be easy for you to start jogging for 15 minutes twice a week , slowly, increase this to 20—30 minutes every day .The longer you join in jogging , the more you enjoy it and the healthier you will become . Some people like jogging alone , and others enjoy doing it with friends . Jogging in groups makes more people keener(热心的)，because you just can not stay in bed while there is a group of friends waiting outside.

    If you want to start jogging , prepare a pair of comfortable shoes and a determined mind.

 以化合价位纵坐标，物质的类别为横坐标所绘制的图象叫价类图．如图为硫的价类图，请分析该图后填空：

（1）E点表示的是二氧化硫，写出它的一条物理性质____；

（2）如图中可表示K₂SO₄，这种盐的点是____ （填字母）；

（3）A点表示的物质类别是____；

（4）写出由B点表示的化合物与氢氧化钠溶液反应的化学方程式____ ．