[单项选择]The long-run production decision differs from the short-run production decision in that:（）
A. variable costs can be changed in the short run but not the long run.
B. variable costs can be changed in the long run but not the short run.
C. fixed costs can be changed" in the long run but not the short run.

[单项选择]The long-run production decision differs from the short-run production decision in that:（　）
A. variable costs can be changed in the short run but not the long run.
B. fixed costs can be changed in the short run but not the long run.
C. fixed costs can be changed in the long run but not the short run.

[单项选择]Monopolistic competition differs from pure monopoly in that:（）
A. barriers to entry are high under monopoly, but low under monopolistic competition.
B. monopolistic competitors are price takers, monopolists are not.
C. monopolistic competitors face downward sloping demand curves, monopolists do not.

[填空题]International migration differs from internal movement in distance and volume, but share the similar______.

[填空题]Organic food differs from conventional food only in the way it is grown.

[判断题]A certificate of deposits differs from the general type of time deposits in that it is negotiable and can be sold to another party before the maturity date.

[填空题]Social support differs from support groups in that the former is often run by mental health professionals.

[单项选择]The language used in advertisements differs from（）used in ordinary readings.
A. which
B. it
C. what
D. that

[填空题]

The tourist industry differs from many others in that it employs more women than many other kinds of business. Indeed, women are found at all levels--from the semi-skilled to management positions--in the transportation companies. Many successful travel agents are women who have established independent enterprises after gaining experience elsewhere in the industry.
Experience is necessary for the successful operation of a travel agency. It has been estimated that a minimum of ten years ’work in the industry is a prerequisite for setting up an agency with the experience. Some agents begin as clerical workers or secretaries in travel agencies or in the transportation companies. Particular jobs that provide useful knowledge include those of ticket agent and reservations agent of the airlines.
In addition to dealing with the public, the travel agent must deal with people who work for the other components in the industry. One of the most important aspects of the j