23. Questions 23 through 33 are based on the following passage and supplementary material.
How Do You Like Those Apples?
Marketed as SmartFresh, the chemical 1M C P (1methylcyclopropene) has been used by fruit growers since 2002 in the United States and elsewhere to preserve the crispness and lengthen the storage life of apples and other fruit, which often must travel long distances before being eaten by consumers. [Q23] 1M C P lengthens storage life by three to four times when applied to apples. This extended life allows producers to sell their apples in the offseason, months after the apples have been harvested. And at a cost of about one cent per pound of apples, 1M C P is a highly costeffective treatment. However, 1M C P is not a panacea for fruit producers or sellers: there are problems and limitations associated with its use.
[Sentence 1] 1M C P works by limiting a fruit’s production of ethylene, [Q24] it is a chemical that causes fruit to ripen and eventually rot. [Sentence 2] While 1M C P keeps apples [Q25] tight and crisp for months, it also limits [Q26] their scent production. [Sentence 3] This may not be much of a problem with certain kinds of apples that are not naturally very fragrant, such as Granny Smith, but for apples that are prized for their fruity fragrance, such as McIntosh, this can be a problem with consumers, [Q27] that will reject apples lacking the expected aroma. [Sentence 4] But some fruits do not respond as well to 1M C P as others [Q28] did, and some even respond adversely. [Sentence 5] Furthermore, some fruits, particularly those that naturally produce a large amount of ethylene, do not respond as well to 1M C P treatment. [Sentence 6] Take Bartlett [Q29] pears, for instance, unless they are treated with exactly the right amount of 1M C P at exactly the right time, they will remain hard and green until they rot, and consumers who experience this will be unlikely to purchase them again. [Q30]
Finally, researchers have found that 1M C P actually increases susceptibility to some pathologies in certain apple varieties. For example, Empire apples are prone to a condition that causes the flesh of the apple to turn brown. Traditionally, apple producers have dealt with this problem by leaving the apples in the open air for three weeks before storing them in a controlled atmosphere with tightly regulated temperature, humidity, and carbon dioxide levels. As the graph shows, the flesh of untreated Empire apples that are first stored in the open air undergoes [Q31] roughly five percent less browning than the flesh of untreated Empire apples that are immediately put into storage in a controlled environment. However, when Empire apples are treated with 1M C P, [Q32] their flesh turns brown when the apples are first stored in the open air, though not under other conditions. Although researchers continue to search for the right combination of factors that will keep fruits fresh and attractive, [Q33] the problem may be that consumers are overly concerned with superficial qualities rather than the actual freshness of the fruit.
Adapted from Hannah J. James, Jacqueline F. Nock, and Chris B. Watkins, “The Failure of Postharvest Treatments to Control Firm Flesh Browning in Empire Apples.” Copyright 2010 by The New York State Horticultural Society.
Begin skippable figure description.
The figure presents a bar graph titled “Results of Treatment to Control Browning of Empire Apples.” On the horizontal axis, there are two categories regarding the control of browning of apples: apples placed immediately in controlled atmosphere, and apples placed in controlled atmosphere after three weeks in open air. For each of the two categories, there are two bars, side by side and, as the key indicates, the bar on the left represents untreated apples, and the bar on the right represents 1-M C P treated apples. The vertical axis is labeled “Percentage of flesh browning” and is labeled with the numbers, from bottom to top, 0 through 60, in increments of 10. There are horizontal grid lines at these numbers. According to the graph, the approximate percentages for the bars, from left to right, are as follows.
For apples placed immediately in controlled atmosphere: untreated, 50 percent; 1-M C P treated, 45 percent.
For apples placed in controlled atmosphere after three weeks in open air: untreated, 8 percent; 1-M C P treated, 52 percent.
End skippable figure description.
Question 23.
Which choice most effectively combines the underlined sentences (reproduced below for your reference)?
1M C P lengthens storage life by three to four times when applied to apples. This extended life allows producers to sell their apples in the offseason, months after the apples have been harvested.