A.find effective cures
B.get emotional comfort
C.ask for financial support
D.consult doctors anytime
67.Which of the following is NOT true for Dr.Livingston’s software?
A.It cuts down medical expenses. B.It decreases the time spent on medical care.
C.It takes doctors closer to their patients. D.It gives patients a medical test online.
D
Pollution is reducing the fragrance of plants and thus preventing bees from pollinating them—endangering one of the most essential cycles of nature, a new study suggests.
The potentially hugely significant research, funded by US National Science Foundation, has found that gases mainly formed from the emissions of car exhaust prevent flowers from attracting bees and other insects to pollinate them. And the scientists who have conducted the study fear that insects’ abilities to drive away enemies and attract mates may also be disturbed.
Professor Jose Fuentes, who led the study, said, “Scent molecules(分子) produced by flowers in a less polluted environment could travel for roughly 1,000 to 1,200 meters. But today they may travel only 200 to 300 meters. This makes it increasingly difficult for bees and other insects to locate the flowers.”
The researchers, who worked on the molecules of snapdragons(金鱼草),found that the molecules are volatile(易挥发的) and quickly bond with pollutants, mainly formed from vehicle emissions. This chemically changes the molecules so that they no longer smell like flowers. A harmful cycle is therefore set up where insects struggle to get enough food and the plants do not get pollinated enough to multiply.
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