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What are pollinators?
What are pollinators?
admin
2018-06-30
32
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.
At the moment, most contaminated wells are found through a time-consuming, labor-intensive process of going village to village and testing each well with a chemical-reaction field kit. After the water is mixed with several reagents, a testing strip is inserted into a sealed container to absorb any arsenic released. The color of the strip after about 10 minutes gives a ballpark result; white indicates the water is clean; red shows it is tainted.
选项
A、How to test the water in contaminated wells.
B、How serious is the problem of tainted water.
C、How tedious is the testing work.
D、How to differentiate the clean water from the poisonous.
答案
A
解析
文章首句是主题句,接着向我们介绍检验的步骤。
转载请注明原文地址:https://kaotiyun.com/show/Uu0O777K
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