Fliesare buzzing. Most people think they are dirty and annoying. But in Bryan Le-组卷网

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Flies are buzzing. Most people think they are dirty and annoying. But in Bryan Lessard's eyes，flies are beautiful insects with great abilities.

Lessard is a researcher at Australia's CSIRO. He is an expert on flies. According to Lessard，more than 159，000 types of flies have been found around the world. The number forms 10﹣15 percent of all the known animals on Earth!

Shocked？The truth is that you can never get away from flies，Lessard says. If you are a chocolate lover，you really should thank flies. Because there would be no chocolate without them!

A tiny kind of fly is the only known pollinator （授粉者） of the flower of the cocoa plant. These special flies are native to countries that are rich in cocoa，such as Brazil and Ecuador. They play a great role in the world's big sales of chocolates. Flies，as well as some other insects，also pollinate Australia's tea trees. Flies are a huge driver of the economy，but we take them for granted.

Flies can also be useful in other cool ways. Take black soldier flies for example. Scientists in Australia，India and US are turning black soldier fly larvae （幼虫） into a nutritious feed for livestock（家畜）. The larvae are 45 percent protein. They find that chickens fed on the larvae grow larger，and don't experience any harmful side effects. As well as that，Chinese researchers from Wuhan's Huazhong Agricultural University have made oil from the black soldier fly larvae and turned the liquid into a form of biodiesel （生物柴油）. So someday our cars could be powered by flies!

【小题1】According to Lessard，flies .

A．are useful to humans

B．are buzzing insects

C．love to eat chocolate

D．are the largest insect group

【小题2】Why should chocolate lovers thank flies？

A．They protect cocoa plants.

B．They pollinate cocoa plants.

C．They protect tea trees.

D．They pollinate tea trees.

【小题3】Who made biodiesel from black soldier fly larvae？

A．Scientists from Australia.