What are pollinators?

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问题 What are pollinators?
  
Rowers are known to employ all manner of trickery to attract pollinators, from taking the shape of an insect mate to emitting wafts of rotting flesh. A South African flower lures in its main pollinators, Desmometopa flies, with the scent of a fresh meal. The flower produces a cocktail of chemicals that mimics those released by a wounded honey bee, drawing flies into a pollen-coated chamber.
Anyone who has struggled to pinpoint his or her location in a mall, airport or urban canyon amid skyscrapers has experienced a GPS gap firsthand. In fact, the global positioning network is filled with them-, buildings, jammers and the landscape itself can block a signal’s path between GPS satellites and receivers in a smartphone or other digital device.

选项 A、How to find which way to go.
B、GPS is an efficient way to find the location.
C、Smartphones are the intelligent devices for people.
D、The global positioning network cannot be seamless.

答案D

解析 “a GPS gap”和“block a signal’s path between GPS satellites and receivers”告诉听者GPS的信号会被干扰。
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