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(车辆)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.

　　Already bees, which pollinate most of the world’s crops, are in such a great decline that has never been known before in Britain and across much of the globe. At least a quarter of America’s 2.5 million honey bee colonies have been mysteriously wiped out by colony collapse disorder(CCD),where hives are found suddenly deserted.

　　The crisis(危机) has now spread to Europe. Politicians insist that CCD has not yet been found in Britain, but considering the present number of bees, the agriculture minister Lord Rooker table bed. Birds also find has sent the warning, “The honey bee population could be wiped out in 10 years.”

　　Although the researchers are not certain whether this is the real cause of CCD, they say that pollution is making life more difficult for bees and other insects in many ways.

　　72. In what way does pollution prevent flowers from attracting bees?

　　A. By shortening the distance traveled by the scent molecules of flowers.

　　B. By disturbing the bees’ ability to attract mates.

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