The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, al though nobody knows exactly when acquired the use of (1) .
The (2) of language is also obscure. No doubt it began very gradually. Animals have a few cries that serve (3) signals, (4) even the highest apes have not been found able to pronounce words (5) with the most intensive professional instruction. The superior brain of man i, apparently (6) for the mastering of speech. When man became sufficiently intelligent, we must suppose that he (7) the number of cries for different purposes. It was a great day (8) he discovered that speed could be used for narrative. There are those who think that (9) picture language preceded oral language. A man (10) a picture on the wall of his cave to show (11) direction he had gone, or (12) prey he hoped to catch. Probably-picture language and oral language developed side by side. I am inclined to think that language (13) the most important single factor in the development of man. Two important stages came not (14) before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture was (15) in human progress to which subsequently there was nothing comparable (16) our own machine age. Agriculture made possible (17) immense increase in the number of the human species in the regions where it could be successfully practiced. (18) were, at first, only those in which nature fertilized the soil (19) each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end (20) the physical comforts it provided.

A:even if B:even C:even though D:even as

The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, although nobody knows exactly when people acquired the use of (1) .
The (2) of language is also obscure. No doubt it began very gradually. Animals have a few cries that serve (3) signals, (4) even the highest apes have not been found able to pronounce words (5) with the most intensive professional instruction. The superior brain of man is apparently (6) for the mastering of speech. When man became sufficiently intelligent, we must suppose that he (7) the number of cries for different purposes. It was a great clay (8) he discovered that speed could be used for narrative. There are those who think that (9) picture language preceded oral language. A man (10) a picture on the wall of his cave to show (11) direction he had gone, or (12) prey he hoped to catch. Probably picture language and oral language developed side by side. I am inclined to think that language (13) the most important single factor in the development of man.
Two important stages came not (14) before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture was (15) in human progress to which subsequently there was nothing comparable (16) our own machine age. Agriculture made possible (17) immense increase in the number of the human species in the regions where it could be successfully practised. (18) were, at first, only those in which nature fertilized the soil (19) each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end (20) the physical comforts it provided.

A:even if B:even C:even though D:even as

A:even if B:even C:even though D:even as

If individuals (are awakened) (each time as) they begin a dream phase of sleep, they are likely to become irritable (even though) their total amount of sleep (has been) sufficient.

A:are awakened B:each time as C:even though D:has been

Here is the story of rubber. From the earliest time it was common knowledge (51) the Peruvians that when a cut was made in the outside skin of a rubber tree, a white liquid (52) milk came out, and that (53) this a sticky (粘的) mass of rubber might be made. This rubber is soft when warm, so that it is possible to give it any (54) . The Peruvians made the (55) that it was very good for keeping out the wet. Then in the early 1800’s, the Americans made use of it for the first time. First they made overshoes to (56) their feet dry. Then came a certain Mr. Mackintosh, who made coats of cloth covered with natural rubber. From that day to this we have been coating cloth with rubber as Mr. Mackintosh (57) , and our raincoats are still named after him.
But these first rubber overshoes and raincoats were all soft and sticky in summer, and (58) and inelastic (无弹性的) in the winter when it was col D. But the rubber we have today is soft and elastic (有弹性的), (59) very strong m even in the warmest summer and the coldest winter. This was made (60) by a man called Goodyear. After many (61) , he found that nitric acid (硝酸) made the rubber much better, but it is not hard and strong enough. Then a strange thing took
(62) . A friend of his, Nicholas Hayward, had the idea in his sleep that rubber might be made hard and strong if mixed with sulfur (硫磺) and put in the sun. Goodyear put this idea (63) the test, and saw that it did have more or less the desired effect though somewhat less than more. The only effect it had was on the outside of the rubber. It is common knowledge now that the (64) to make rubber hard and strong is by heating it with sulfur. It took Goodyear four more years to find this metho D. When at last he did it, he had (65) at all. Everything of the smallest value had been used to get money, even his sons’ school-books.

A:or B:however C:though D:even

下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。

A:or B:however C:though D:even

His package looks pretty, people will buy just about anything. So says an advertising executive in New York, and he has proved his point by selling boxes of rubbish for the price of an expensive bottle of wine. Justin Gignac, 26, has sold almost 900（1）presented plastic boxes of rubbish from the street of the Big Apple at between ＄50 and ＄100 each. Buyers from 19 countries have paid for the souvenirs(纪念品). The idea has been so successful that he is thinking of promoting it around the world. It all began when Mr. Gignac was at a summer workshop. "We had a discussion about his importance of （2）," he recalls. "Someone said packaging was unimportant. I disagreed. The only way to prove it was by selling something nobody would ever want." He searches the streets of Manhattan and typical（3） include broken glass, subway tickets, Starbucks cups and used（4）forks. "Special editions" are offered at a high price. He charged ＄100 for rubbish from the opening day of the New York Yankees stadium. Mr. Gignac denies（5）his customers for fools: "They know what they're getting. They appreciate the fact that they're taking something nobody would want and finding beauty in it." Some（6）customers include people who used to live in the city and want a down to earth souvenir. He claims he has even sold to art collectors. Realizing that the concept appears to be a real moneymaker, Mr. Gignac has（7）a company and is employing his girlfriend as vice president. He（8）to discuss his profit margins: "Its actually quite a lot of effort putting them together-but yet, garbage is free."Mr. Gignac is considering more varieties of souvenirs. He maintains that he has signed（9）with people interested in（10）projects from as far as Berlin and London.
 

A:But B:However C:Even D:Though

His package looks pretty, people will buy just about anything. So says an advertising executive in New York, and he has proved his point by selling boxes of rubbish for the price of an expensive bottle of wine. Justin Gignac, 26, has sold almost 900（1）presented plastic boxes of rubbish from the street of the Big Apple at between ＄50 and ＄100 each. Buyers from 19 countries have paid for the souvenirs(纪念品). The idea has been so successful that he is thinking of promoting it around the world. It all began when Mr. Gignac was at a summer workshop. "We had a discussion about his importance of （2）," he recalls. "Someone said packaging was unimportant. I disagreed. The only way to prove it was by selling something nobody would ever want." He searches the streets of Manhattan and typical（3） include broken glass, subway tickets, Starbucks cups and used（4）forks. "Special editions" are offered at a high price. He charged ＄100 for rubbish from the opening day of the New York Yankees stadium. Mr. Gignac denies（5）his customers for fools: "They know what they're getting. They appreciate the fact that they're taking something nobody would want and finding beauty in it." Some（6）customers include people who used to live in the city and want a down to earth souvenir. He claims he has even sold to art collectors. Realizing that the concept appears to be a real moneymaker, Mr. Gignac has（7）a company and is employing his girlfriend as vice president. He（8）to discuss his profit margins: "Its actually quite a lot of effort putting them together-but yet, garbage is free."Mr. Gignac is considering more varieties of souvenirs. He maintains that he has signed（9）with people interested in（10）projects from as far as Berlin and London.
 

A:But B:However C:Even D:Though