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1. Aphids, which are particularly vulnerable to predators because of their gregarious habits and sedentary nature, secrete an alarm 51 pheromone when attacked that causes nearby aphids to respond by moving away.
The word “sedentary” is closest in meaning to which of following?
(A) inactive (B) inefficient (C) unchangeable (D) unbalanced
2. These innovations in manufacturing boosted output and living standards to an unprecedented extent;the average per capita wealth increased by nearly 1 percent per year30 percent over the course of a generation.
The word “boosted” is closest in meaning to which of following?
(A) ensured (B) raised (C) arranged (D) discouraged
3. Since the 1790’s, North American entrepreneurs — even without technological improvements — had broadened the scope of the outwork system that made manufacturing more efficient by distributing materials to a succession of workers who each performed a single step of the production process.
The word “scope” is closest in meaning to which of following?
(A) value (B) popularity (C) extent (D) diversity