PrepTest 156, Section 3, Question 22
Organic chemist Larry Koskan's inspiration arrived in the(447 more words not shown)
Which one of the following(9 more words not shown)
- APolyaspartate was once(20 more words not shown)
- BThe success of(19 more words not shown)
- CPolyaspartate, which Koskan(19 more words not shown)
- DKoskan's work with(19 more words not shown)
- EAlthough polyaspartate is(24 more words not shown)
Reading the passage
We already predicted a promising alternative with a commercial obstacle. Polyaspartate can perform useful work and biodegrade, but its higher price stalled broad adoption. Koskan's company has nevertheless found successful specialized uses.
What we’re looking for
Look for a version of that whole story. The final hope for the environmental chemistry sector is an implication of continued success, rather than a replacement for the central account of the chemical's promise and barriers.
Working the answers
- A
The obstacle is cost, not technical shortcomings that make the chemical useful only in niches. Nor does the author say its takeover was inevitable. The ending leaves open further success rather than declaring a permanent limit on its usefulness.
- B
This captures the final possible benefit to the industry's reputation. It leaves out the larger story of why polyaspartate is promising, why companies hesitated, and how specialized uses have provided a way forward. A supported closing implication is still too narrow to serve as the main point.
- CCorrect
The environmental advantage is biodegradability; the commercial promise appears in the oil and farming applications; the barrier is cost. This brings the major parts together without treating broad success as guaranteed or failure as inevitable.
- D
The oyster example doesn't establish that alternatives to many industrial chemicals can be found throughout plants and animals. The author develops the particular case of polyaspartate, not a general recommendation to search nature for replacements.
- E
The ending is hopeful about continued success. It doesn't predict probable marketplace failure, and the specialized successes already complicate that pessimistic conclusion.
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