6．Flies are buzzing．Most people think they are dirty and annoying．But in Bryan Lessard's eyes.flies ——青夏教育精英家教网—

6．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!

32．According to Lessard，fliesA．
A．are useful to humans
B．are buzzing insects
C．love to eat chocolate
D．are the largest insect group
33．Why should chocolate lovers thank flies？B
A．They protect cocoa plants．
B．They pollinate cocoa plants．
C．They protect tea trees．
D．They pollinate tea trees．
34．Who made biodiesel from black soldier fly larvae？D
A．Scientists from Australia．
B．Scientists from India．
C．Scientists from US．
D．Scientists from China．
35．Scientists found that black soldier fly larvaeA．
A．can be a great feed for livestock．
B．can cause harmful side effect．
C．can help chickens grow healthily．
D．can produce oil to power a car．

5．Being a fit and healthy person is very important for lots of people today．In fact，some people like running and exercising so much that they become obsessed with keeping track of it．
Thanks to fitness apps，people can measure every step they take，what they eat and every calorie they burn．They might wear a special watch on their wrist，shoes on their feet or use different apps on their phone to measure their movements．Importantly，once they have done that they post it on social media．All of their friends can see where they've run，what workout they've done or what they had for lunch．Sounds familiar？
Doctor Daniel Kraft from the United States makes gadgets（小器具） for people like this．He told the Digital Health Summit that these people，known as"trackaholics"，would become normal in the future．
And I think he's right．I can see the world of health and fitness changing around me every day．
One of my friends，named Anna Palmer，is always using the latest fitness gadgets．Her favorite is an app called Argus．She uses it on her phone to measure her steps，heart rate and amount of calories she has burnt．She always posts these things，and pictures of herself exercising，on social media．"It's nice to know exactly how much exercise you have done，rather than guess，"she said．"That way I can keep pushing myself to improve．"
Also，my friends in China use WeChat to compare how many steps they've taken each day．They are very competitive about this!

28．The underlined phrase"obsessed with"in the first paragraph means"C"．
A．busy with
B．angry with
C．crazy about
D．surprised at
29．What does the second paragraph talk about？B
A．How fitness apps work in a proper way．
B．What people can do with fitness apps．
C．What advantages fitness apps have．
D．How fitness apps affect social media．
30．According to Doctor Daniel Kraft，more people willC．
A．run to keep fit
B．make fitness gadgets
C．choose fitness gadgets
D．improve their fitness
31．What's the writer's attitude towards fitness gadgets？D
A．Negative．
B．Subjective．
C．Indifferent．
D．Positive．

4．Solar power and wind are rrenewable energy resources； they are ideal alternatives to support the development of industry．

3．While it may not be worthwhile for older patients，younger patients are more likely to regard anything that gives them a lifelong working knee joint as well worth the cost．

2．When the two groups of children are communicating with each other，scientists find that they have quite different ccharacteristics，such as personality，motivation，temperament（气质），etc．

1．The church tower whichis being constructed（construct） will be open to tourists soon．The work is almost finished．

20．Charles Darwin，the British naturalist and biologist，made a very positive contribution toexplaining（explain） the evolution of the human species．

19．The reasonthat/whichhe gave for being late for the meeting was that he forgort to use the alarm clock．

18．The director ordered that the gate and windows（should）be closed（close） firmly before leaving the office．

17．The population of Chongqinghas grown（grow） to more than seven times what it was in 1949．The figure is now approaching 8.5million．

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