题目内容
A short time before she______, the old lady _______ a will, leaving all her money to her brother.
A. died; has written B. has died; wrote
C. had died; wrote D. died; had written
D。
解析:
过去发生的两个动作有时间上的先后顺序时，先发生的用过去完成时，后发生的用一般过去时。
Between 10,000 and 15,000 years ago, some humans discontinued their wandering hunting and gathering and settled down to farm. Grain was the first domesticated crop that started that farming process.
The oldest proven records of brewing are about 6,000 years old and refer to the Sumerians. Sumeria lay between the Tigris and Euphrates rivers including Southern Mesopotamia. It is said that the Sumerians discovered the fermentation (发酵) process by chance. No one knows today exactly how this occurred, but it could be that a piece of bread or grain became wet and a short time later, it began to ferment.
The Sumerians were able to repeat this process and are assumed to be the first civilized culture to brew beer. They had discovered a “divine drink” which certainly was a gift from the gods. The word beer comes from the Latin word bibere, meaning “to drink”, and the Spanish word cerveza originates from the Greek goddess of agriculture, Ceres.
A vitamin-rich porridge, used daily, beer is reported to have increased health and longevity and reduced disease and malnutrition (营养不良). The self-medicating properties of alcohol-rich beer also eased the tensions and stresses of daily living in a hostile world. The use of yeast (酵母) was not yet known at that time. The success of the fermentation process was left to chance, as the brewers unknowingly relied on yeast particles in the air.
Considerable scientific research took place in breweries (酿酒厂) in the 19th century. A famous work from 1876 by Louis Pasteur was Studies Concerning Beer where he revealed his knowledge of micro-organisms. By establishing that yeast is a living microorganism, Pasteur opened the gates for accurately controlling the conversion (转换) of sugar to alcohol.
Another discovery in beer brewing was the work of Christian Hansen, a Danish scientist, who successfully isolated a single yeast cell and induced it to reproduce on an artificial culture medium. With the resulting yeast multiplication (繁殖) methods, the purity of the fermenting process has been improved.
1.According to the passage, who was the first to brew beer?
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A．The Greeks. |
B．Christian Hansen. |
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C．Louis Pasteur. |
D．The Sumerians. |
2.The last two paragraphs mainly talk about .
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A．the function of micro-organisms |
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B．the success of the fermentation process |
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C．two scientific discoveries about brewing |
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D．the results of yeast multiplication methods |
3.According to the text, which of the following is NOT true?
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A．Grain was the first crop used to brew beer. |
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B．There are some yeast particles in the air. |
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C．The word “beer” originates from Latin. |
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D．Modern beer contains more alcoholic. |
4.Which would be the best title for the text?
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A．The beer culture. |
B．The history of beer. |
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C．The earliest brewery. |
D．Methods of brewing beer. |
_____ a certain doubt among the workers as to whether he could finish the task in a short time．
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A．It was |
B．There had |
C．There existed |
D．It had |