年代地层单位中的下二叠统又可表述为地质年代单位中的（）和（）。
题型：填空题
问题：
年代地层单位中的下二叠统又可表述为地质年代单位中的（）和（）。
题型：填空题
Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.
If the 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 41 presented plastic boxes of rubbish from the street of 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 the importance of 42 ,”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 43 include broken glass, subway tickets, Starbucks cups and used 44 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 45 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 46 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 money-maker, Mr Gignac has 47 a company and is employing his girlfriend as vice president. He 48 to discuss his profit margins: “It’s actually quite a lot of effort putting them together-but yes, garbage is free.”
Mr Gignac is considering more varieties of souvenirs. He maintains that he has signed 49 with people interested in similar projects from as far as Berlin and London.