- 2018年03月30日18:00 来源：小站整理
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Writing & Language
In recent years, several urban US airports haveconverted some of the unused land past theirrunways to provide habitats for honeybees. Whileairports may seem unlikely locations for beekeeping, many of them, in fact, have the potential to offerideal conditions for an apiary (a group of beehives). The Lambert-St. Louis International Airport, for instance, hosts an apiary on a 400-square-footarea of land just north of one of its runways. This area is rich in Dutch clover, a preferred foodsource for honeybees. The honeybees may thrive there in part because they aren’t exposedto the agricultural pesticides suspected of contributing to Colony Collapse Disorder. Thoughunorthodox, airport-based honeybee habitats can help to ensure that local regions havehealthy populations of honeybees.
Choice A is the best answer because it follows theconventions of standard English usage. "Past" isused here as a preposition to indicate the locationof the honeybee habitats. "Their" is used as apossessive determiner to indicate that the runways are those of the airports.