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遗传瓶颈（Genetic bottle neck）
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59. _____ should be the most important part(s) to be protected in anearthquake,A. Your head and arms B. Your armsC. Your neck and arms D. Your head and neck
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（B）The surprising experiment I am about to describe proves that air is all around you and that it proves down upon you. Air pressure is a wonderful force. When you swim underwater, you can feel water push down your body. The air all around you does the same. However, your body is so used to it that you do not notice this. The pressure is caused by a layer of air called the atmosphere. This layer surrounds the Earth, extending to about five kilometers above the Earth’s surface.The following experiment is an easy one that you can do at home. But make sure that you are supervised, because you will need to use matches. Now foe the experiment！What you need?A hard-boiled egg without the shell?A bottle with a neck slightly smaller than the egg?A piece of paper?A matchMetheod1） Check that the paper will sit firmly on the neck of the bottle.2） Tear the paper into strips and put the strips into the bottle.3） Light the paper by dropping a burning match into the bottle.4） Quickly sit the egg on the neck of the bottle.ResultAstonishingly, the egg will be sucked into the bottle. Your friends will be amazed when you show them the experiment. But be careful when you handle matches.Why it happenedAs 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.
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In the experiment, the burning inside the bottle can___.A. equalize the air pressure inside and outsideB. make a seal in the neck of the bottleC. finish up the oxygen inside the bottleD. produce more oxygen inside the bottle
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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.
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Our starboard derrick boom of hatch No.4 is badly cracked ____ that it has become entirely useless.A.at its goose neck to such a extentB.at it’s goose to such an extentC.at it’s goose neck for such a extentD.at its goose neck to such an extent
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单选题0ur starboard derrick boom of hatch No.4 is baddly cracked（）that it has become entirely useless.A
at its goose neck to such a extentB
at it's goose neck to such an extentC
at it's goose neck for such a extentD
at its goose neck to such an extent
考题
单选题Our starboard derrick boom of hatch No.4 is badly cracked（）that it has become entirely useless.A
at its goose neck to such a extentB
at it's goose neck to such an extentC
at it's goose neck for such a extentD
at its goose neck to such an extent
考题
名词解释题遗传瓶颈（Genetic bottle neck）
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