原发性高血压是指（）。A.慢性肾炎引起的高血压 B.肾动脉狭窄引起的高血压 C.嗜铬

If you go into the forests with friends, stay with them. If you don’t, you may get lost. If you do get lost, this is what you should do.

Sit down and stay where you are. Don't try to find your friends. Let them find you. You can help them to find you by staying in one place.
There is another way to help your friends or other people to find you. Give them a signal( 信号 )by shouting or whistling(吹口哨) three times. Stop. Then shout and whistle three times again. And signal given three times is a call for help,
If you don't think that you will get help before night comes, try to make a small room with branches( 树枝 ) 。
What should you do if you get hungry or need to drink water? You would have to leave your little branch room to look for something to eat and drink. Don't just walk away. Drop small branches as you walk so that you can find your way hack.
The important thing to do when you are lost -- stay in one place.

Title	How to deal with getting lost
Ways	①__小题1:___and stay where you are ②Give friends __小题2:__by shouting and whistling three times ③If you don’t get help before night comes, try to_小题3:a room with branches ④Drop some small 小题4:as you walk so that you can find your way back.
Conclusion	There are many ways to deal with getting lost，but the most important Way is to stay in ___小题5:__place .