| There are four basic types of
competition in business that form a continuum from pure competition through
monopolistic competition and oligopoly (商品供应垄断) to monopoly. At one end of the
continuum, pure competition results when every company has a similar product.
Companies that deal in commodities such as wheat or corn are often involved in
pure competition. In pure competition, it is often the ease and efficiency of
distribution that influences purchase. In contrast, in monopolistic competition several companies may compete for the sale of items that may be substituted. The classic example of monopolistic competition is coffee and tea. If the price of one is perceived as too high, consumers may begin to purchase the other. Coupons and other discounts (折扣) are often used as part of a marketing strategy to influence sales. Oli A. corn B. electricity C. airline tickets D. coffee [填空题]平均而言, the water is a little more than two miles deep.
[填空题]Twenty-four years and two days ago, on a Tuesday morning, the space shuttle Discovery (26) to low Earth orbit from Cape Canaveral, Florida. As NASA’s newest eye in the sky, the Hubble Space Telescope, is an (27) which can peer deep into the cosmos and capture the universe’s inhabitants in exquisite detail. It had taken (28) of design and planning to get the telescope ready for work. The next day, on April 25, astronauts delivered the telescope to space.
Then, scientists eagerly (29) Hubble to start revealing cosmic secrets. We all know what happened next. A flaw in the telescope’s (30) mirror meant the images weren’t sharp. (31) incredibly faint objects, such as very distant galaxies, wasn’t possible. It would be three years before the first of five servicing missions let astronauts correct the defect and (32) Hubble’s vision to what it should have been. Since then, though, the Hubble space teles 我来回答: 提交
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