阅读下面一段材料，并根据其内容完成信息记录表。
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Aunt Ma sees an ad(广告)in a newspaper for a nice bed in a shop. It costs 600 yuan. Aunt Ma likes it, so she goes to the shop. The shopkeeper (店主) shows one to her. Aunt Ma has a look at it and says, “There aren’t any beautiful pillows (枕头) on this bed, but there are many on the bed in your ad.”
“Yes, that is an ad,” answers the shopkeeper. “If you want a bed the same as the one in the ad, you need to pay 60 yuan more.”
Aunt Ma isn’t happy. Then she says, “That’s dishonest.”
“Well,” answers the shopkeeper. “Look, there is a girl on a bike in an ad in your newspaper too, but can you buy the bike with the girl?”
【小题1】How does Aunt Ma know about the bed?

What do you do if you're stranded（处于困境的）on a lonely island? Surely you need to find a way to get in touch with the outside world. Your best chance of doing this is to draw the attention of a passing plane.
　　Body signals（信号）
　　Pilots from different countries understand body signals if they have the correct training. When you wave your arms up and down in a straight line, it means "yes". When you point downwards and swing your arm from side to side, it means "no". If you want the pilot to know that it's safe to land, push your hands out in front of you and bend（弯曲）your knees. If you want to say that it's not safe to land, put your arms in the air and move them to one side.
　　Smoke signals
　　The smoke from a fire can be seen from far away, so it's a good way to draw attention. If the weather is dry, it isn't hard to start a fire. Remember, however, that fires can be very dangerous if they get out of control. Never light a fire unless you're sure that it can't spread. If the ground is dark, light smoke can be seen more easily. Green grass and leaves produce light smoke.
　　Ground-to-air signals
　　It's a good idea to build some signals, too. Use large pieces of wood to make the symbols(标记). If you can't find any wood, use earth. Some useful symbols are:
　　F "I need food and water."
　　II "I need medicine."
　　I "I am badly hurt."
　　X" I am unable to move from here."
　　Pilots' replies
　　If the pilot lowers the plane's wings from side to side, this means "message received and understood". (At night, the pilot flashes the plane's green lights.) If the pilots flies the plane in a clockwise circle, this means "message received but not understood".(At night, the pilot flashes the plane's red lights.)
However, there is no signal which means "message not received". Why not?
【小题1】 Which picture means "it's not safe land"?

　
【小题2】 What can we learn from the passage?