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How does the writer feel about sounds in general？ 查看材料
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谐波制动的变压器纵联差动保护中，设置差动速断元件的主要原因是()。
零序电流过滤器和零序电流互感器只有在()时，才有零序电流输出。
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Twelve years ago， oceanographer Captain Charles Moore was skippering his yacht the Alguita in the North Pacific. He sailed into a mass of floating plastic rubbish which took him and his crew a week to cross. This floating rubbish dump is now called the Great Pacific Garbage Patch and doubles the size of the USA.
The United Nations says there are now 18，000 pieces of plastic in every square kilometre of sea everywhere in the world. A walk along any beach will give you some idea of the seriousness of plastic pollution.
The trouble is， when we throw out plastic with the trash， the plastic doesn"t go away. Plastic does not biodegrade. It photo degrades into smaller and smaller particles which then enter the food chain.
Plastics contain cancer-causing chemicals along the food chain in increasing concentrations and end up in our fish and chips， along with hormone disruptors. Scientists try to tell us that we are killing ourselves as well as other animals. At least 200 species are， as I speak， being killed by plastic.
Whales， dolphins， turtles and albatross confuse floating plastic， especially shopping bags and six pack rings， with jellyfish.
Some countries have rebelled and banned plastic bags. And the first was brave Bangladesh. Then China took the same decision. Botswana， Canada， Israel， Kenya， Rwanda， Singapore and South Africa have also banned plastic bags. Notice how many of the world"s richest countries are not on this list. It"s an absolute disgrace.
Think globally， act locally. A small Australian town is now one step ahead of the rest of the world. The inhabitants of Bundanoon in New South Wales have banned plastic bottles from the town.
We need to follow their example and eliminate plastic from our lives， take care of the earth and vote for people we think will do the same.
The writer says that we can get an idea of how much plastic rubbish there is in the oceans by________. 查看材料
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Many people want to know how to analyze problems they meet. There are six stages in analyzing a problem.
First the person must recognize that there is a problem. For example， Sam"s bicycle is broken，and he cannot ride it to class as he usually does. Sam must see that there is a problem with his bicycle.
Next the thinker must define the problem. Before Sam can repair his bicycle， he must find the reason why it does not work. For instance， he must determine if the problem is with the gears， the brakes， or the frame. He must make his problem more specific.
Now the person must look for information that will make the problem clearer and lead to possible solutions. For instance， suppose Sam decided that his bike does not work because there is something wrong with the gear wheels. At this time， he can look in his bicycle repair book and read about gears.
He can talk to his friends at the bike shop.
After studying the problem， the person should have several suggestions for a possible solution.
Take Sam as an illustration. His suggestions might be : put oil on the gear wheels ; buy new gear wheels and replace the old ones; tighten or loosen the gear wheels.
Eventually one suggestion seems to be the solution to the problem. Sometimes the final idea comes very suddenly because the thinker suddenly sees something new or sees something in a new way. Sam，for example， suddenly sees that there is a piece of chewing gum between the gear wheels. He immediately realizes the solution to his problem: he must clean the gear wheels.
Finally the solution is tested. Sam cleans the gear wheels and finds that afterwards his bicycle works perfectly. In short， he has solved the problem.
In analyzing a problem we should do all the following except________. 查看材料
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