[单项选择]
THE PRODUCTION OF COFFEE
1 All great coffee comes from the same tree, Coffea arabica. The distinguishing taste of coffee is a product of the climate, air, and soil in which it is grown. The perfect climate for coffee production exists between the latitudes of 25 degrees north and 25 degrees south of the equator. The coffee plant is particular about temperature, and changes of more than 20 degrees in twenty-four hours, or temperatures of over 70 degrees Fahrenheit, tend to have harmful effects on production. In general, coffee trees are comfortable where people are. If people feel too cold or hot, especially during flowering and fruit development, the trees are not likely to do well.
2 Altitude is an important factor, and most coffee-producing countries grade their coffees according to the altitude at which they were grown. The best-tasting coffees are grown at between five and eight thousand feet in elevation, in the thin air and
A. A mountainous region close to the equator
B. A region with a large coffee-drinking population
C. A coastal region with a moderate amount of rainfall
D. A region with an average temperature of 70 degrees F
