Why it happened

　　As the paper burns, it needs oxygen and uses up the oxygen （air） in the bottle. The egg acts as a seal in the neck of the bottle, so no more air can get inside. This reduces the air pressure inside the bottle. The air pressure must equalize, so more air from outside must enter the bottle. The outside air pressure against the egg and then the egg is pushed into the bottle! The proves that air is all around and that it is pressing down on it.

　　60. Why is there the need to take care when you are doing the experiment?

　　A. The bottle could break.

　　B. You need to light the paper with a match.

　　C. The egg needs to be shelled.

　　D. The egg has to be perfectly placed on the neck of the bottle.

　　61. In the experiment, the burning inside the bottle can___.

　　A. equalize the air pressure inside and outside

　　B. make a seal in the neck of the bottle

　　C. finish up the oxygen inside the bottle

　　D. produce more oxygen inside the bottle

　　62. How did the egg put into the bottle？

　　A. The oxygen inside the bottle sucked the egg in.

　　B. It became salt without the shell.

　　C. The neck of the bottle was wide enough.

　　D. The outside air pressure forced it into the bottle.

　　63. The experiment is carried cut to prove ______.

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