读“我国沿北纬32°地形剖面图”，完成下列要求。

       These days computer games have bcome more and more popular in many cities and towns. A lot of small shops along busy 1have changed into computer game houses in order to get more 2. These places are always crowded with people
       In the computer game houses, people 3a lot of money matching on the machine. It's4for one to beat a computer, but one can do well after trying again and again. People want to5 when they play computer games. The more they6, the more they want to win, and at last they even can't 7without it.
       The result is that some people don’t want to8and they play in computer game houses for hours and hours. For school boys, things are 9. They don't want to have10. When school is over, they rush to the computer houses near their 11. Some of them can get enough money from their 12 Some of them are not13to get the money. So they have to steal or rob others' and become14 . Computer game addiction(上瘾) is a 15problem in our life. Something has to be done to stop it.

图为我国华北地区等高线地形图，仅考虑自然条件，图中乙村与甲村相比（   ）

要使马铃薯和甘薯高产应当注意使用哪种无机盐（　　）