【简答题】The Continuing Popularity of the Fountain Pen The fountain pen is still a very attractive and practical object, even in these days of cheap,【81】(dispose) ball-point and felt-tip pens. Few owners are【8...
【单选题】A country produces only cans of soup and pens and it is producing at a point on its bowed out PPF. If the country increases the production of soup, the opportunity cost of an additional _________.
C.
can of soup is constant
【简答题】O. Henry was the pen name of American writer Sydney Porter, whose sores, arc famous for their surprise endings, to the point that such an ending is often mentioned as an ‘o. Henry ending’ He was born ...