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1. Sample Text 1 — Climate Tipping Points

Scientists warn that global warming may trigger irreversible “tipping points” — such as the collapse of the Greenland ice sheet or the die-off of the Amazon rainforest — that would accelerate warming far beyond what current climate models…

A. have confidently predicted. B. predict will occur under any scenario. C. fully account for in their projections. D. suggest is the most likely outcome.

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2. Sample Text 2 — Antibiotic Discovery

The last entirely new class of antibiotic to enter clinical use was discovered in the 1980s, and the global pharmaceutical pipeline for new antibiotics remains thin — partly because the economics of antibiotic development discourage investment in drugs used…

A. frequently and profitably by hospitals. B. for only short periods before resistance develops. C. exclusively in veterinary medicine. D. only in wealthy, high-income countries.

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