1.（2019·杨浦·一模）
A Newly Discovered Tea Plant Is Caffeine-free
The world loves tea and some 3 million tons of tea are consumed every year.Tea can be good for health，as it contains compounds that help to lower cholesterol（胆固醇）and reduce the risk of heart disease.But there is a downside.Tea contains caffeine which，（1）_________it improves mental alertness，can also cause anxiety，insomnia and other problems.
(2)_________would be agreeable is that a tea plant that provides all the taste and goodness but with little or(3)_________of the caffeine has been found.Liang Chen and Ji-Qiang Jin of the Tea Research Institute of the Chinese Academy of Agricultural Sciences have discovered just such a plant(4)_________(grow)wild in a remote area in Fujian Province,southern China.(5)_________they report in The Journal of Agricultural and Food Chemistry,not only is the tea plant naturally caffeine-free but it also contains a number of unique medicinal compounds that,the locals believe,offer considerable health benefits.
(6)_________(know)locally as Hongyacha,the newly discovered plant grows only between 700 and 1,000 metres(7)_________sea level around a handful of Chinese villages.
Now the researchers(8)_________(explore)methods to protect Hongyacha in its natural habitat while further studies are carried out.It can take time—and sometimes it does not work—for new plant varieties(9)_________(breed)for commercial use.A pair of naturally caffeine-free coffee plants were discovered in 2003,but little progress(10)_________(report).Tea enthusiasts will be watching Hongyacha with interest.And others will wonder what else is out there.
(word count 275,readability level 11.6)
2.（2019·黄浦·一模）
Just How Buggy Is Your Phone?(www.xing528.com)
What item in your home crawls with the most germs?If you say(1)_________toilet seat,you're wrong.Kitchen sponges top the list.But cell phones are pretty dirty too.They contain around 10 times as many germs as toilet seats.People touch their phones,laptops,and other digital devices all day long,yet rarely clean them.
In one incident,a thief paid a terrible price for stealing a germy cell phone.He stole it from a hospital in Uganda during a widespread of the deadly disease Ebola.The phone's owner reported the theft before(2)_________(die)from the disease.Soon,the thief began showing symptoms and finally(3)_________(confess)to the crime.
(4)_________in that unusual case a cell phone carried dangerous bacteria,not all germs are bad.Most cause no harm.In fact,they could provide helpful information.Look at the surface of your phone carefully.Do you see some dirty marks?“That's all you,”says microbial ecologist Jarrad Hampton-Marcell.“That's biological information.”
It turns out that the types of germs that you apply all over your phone or tablet are different from(5)_________of your friends and family.They're like a fingerprint that could identify you.Some day in the future,investigators may use these microbial fingerprints to solve crimes.Phones and digital devices may be one of the best places to look for buggy clues.
In a 2017 study,researchers sampled a range of surfaces in 22 participants'homes,(6)_________countertops and floors to computer keyboards and mice.Then they tried to match the microbial fingerprints on each object to its owner.The office equipment was easiest to match to its owner.In an(7)_________(early)study,a different group of researchers found that they could use microbial fingerprints to identify the person who(8)_________(use)a computer keyboard even after the keyboard sat untouched for two weeks at room temperature.
One day,microbial signatures might show(9)_________people have gone and what they have touched.They could give the proof(10)_________an unmarked device is yours.So,sure,your phone is pretty germy.Does that inspire you,or does it just bother you?
(word count 365,readability level 7.0)
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