.h
section 4原文背景:
Saucer-type Open Grease Lamps
The first type of mine light, the open saucer-type grease lamp, was popular in the 1700s and was often decorated with ornamental figures such as roosters. These figures acted as good luck charms for the miner.
Candles
Later, candles made of hard tallow became a popular source of light within the mines. The candle-holder was adopted for use in the mines as well. It consisted of a 3/8-inch iron rod twisted into a looped handle at one end and a sharpened point at the other. Often there was a hook on the holder and when the point could not be driven into a suitable support, the holder could be hung from any overhang or protrusion in the mine.
Safety Lamps
The man who made the real breakthrough in this area was Sir Humphry Davy when he invented what is known as the Davy Lamp or a gauze-enclosed lamp. Although gauze alone could not guarantee that the flame would not come into contact with gases outside the screen, Sir Davy reasoned that a metal mesh would cool down the flame before it came into contact with any fire damp. These gases explode at certain temperatures but will extinguish a flame that is cooler.
To prevent miners from opening their safety lamp underground, considerable attention was paid to locks. Most safety lamps were equipped with a padlock, keyed setscrews, melted soft-metal locking inserts or magnetic spring-loaded latches.
Carbide Lamps
In 1892, while working with lime, coal tar and a carbon mixture, Major James T. Morehead and Thomas L. Willson developed a brownish-grey substance that gave off a pungent smelling gas when mixed with water. This gas burned with a bright yellow-white flame and they called it acetylene. Within eight years the first carbide lamp was offered to the public.
A类阅读
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G类阅读
第一篇是MATCHING,一个公园里面的设施跟活动的配对
第二篇是MATCHING,小孩子活动的一些配对
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第四篇是一个语言学校,然后做填空题。要求用THREE WORDS的,我觉得自己写得有点怪
第5篇就是最长的那个,写个画家的一生。前面的是MATCHING,谁曾经跟她干嘛干嘛的配对
第2部分是T/F/NG
第3部分是2道选择题,记得答案是G,H
G类写作
小作文是you organized for a relative a 90th birthday party in a hotel, many elderly guests attended this party, and this party is of great success
write to the hotel manager:
give the details of the party
the reason why the party so successful
mention a stuff helped you a lot/ helps provided by a stuff of hotel
大作文: Some people think competitive sport is important for a childs education. Others think it has negative effects on children. Disscuss both the views and.....
A类作文
小作文很简单,3个大饼图,these charts below show the proportion of main regions of exports from three latin american countries
大作文 some think that these environmental problems are too big for individuals to be solved,while others think that individuals cannot solve these environmental problems unless they make some action.
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