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BRome wasn't built in a day.And neither was the Roman subway system.Underground work is slow going,because construction workers often meet withfrescos()and other valuable stone foundations thousands of years ago.And afew years ago,they found the wooden foundations of a luxurious porch from a Romanbuilding.So local archaeologists called in Mauro Bernabei of the National Research Councilof Italy.He's a dendrochronologist:someone who analyzes tree rings,which give ageand environmental information."We have to study wood because it's full,really full,of information!"Bernabeiand his team found that the wooden planks were oak().But the wood's originwas harder to determine.So they compared the tree rings in the oak planks to thoseavailable in libraries of tree rings that contain timber from all over Europe.And theyfound a match for the Roman wood-from the Jura region of eastern France,morethan 600 miles away.The researchers also determined that it was used in about 40 to 60 C.E.Andsome came from trees already up to 300 years old when they were cut down.Thedetails are in the journal PLOS ONE.The discovery is the first clear evidence of oak from north of the Alps being usedto build ancient Rome.And it's a reminder that the Romans had a complex tradingnetwork.These trees,for example,likely floated down two rivers,across theMediterranean and up another river to Rome.Bernabei says Roman archaeologists usually destroy ancient wood-it's not asvaluable as jewelry and vases and frescos.But he's hoping this study might changetheir minds."Save the wood,yes!And call me,if you don't want to save-please,call me!”he says.24.Why does the subway construction in Rome go slowly?A.It is hard to dig up the earth in Rome.B.There are many ancient ruins buried here.C.It is very dangerous to work too fast in Rome.D.The Romans are not experienced in building subways25.What can people learn from the wooden foundations?A.The wealth in ancient Rome.B.The trading information of ancient Rome.C.The culture of ancient Rome.D.The social relations of ancient Rome.26.What does the underlined word "it"in paragraph 4 refer to?A.The stone.B.The subway.C.The French wood.D.The Roman foundation27.What is the main idea of this passage?A.Scientists found some information about ancient RomeB.Wood was not as valuable as stones in ancient Rome.C.Only the rich people in ancient Rome could use woodD.Ancient Rome could have a rich trading network.C"Shine in the dark"dolphins may seem like something straight out of a sciencefiction movie.However,that is precisely what Newport Coastal Adventures'CaptainRyan Lawler and professional videographer Patrick Coyne witnessed,when they setout to explore the spectacular blue tides that have been lighting up the waters offSouthern California's coast since mid-April.The partners scanned the ocean for hours and were returning to shore when theyspotted the“electric'”dolphins swimming through the bloom of shining plankton(浮游)The videographer,who had seen the phenomenon only once before in a Netflixshow,says catching the scenes proved to be a lot harder than he had expected."Forstarters,the shining plankton has sweet spots to where it shows up and then fadesaway,so while on the water,it's impossible to just find it,"Coyne says."Also,conditions have to be absolutely perfect for the shining plankton to show and foranimals to swim through it so we can film it.Though witnessing shining sea life is rare,the electrifying blue ocean scenery is afairly common sight around Southern California between February and September.The phenomenon can be attributed to the presence of millions of plankton,which tendto gather and reproduce in large quantities in the warm coastal waters during thistime.Though a majority of California's red tides are caused by plankton species that donot produce deadly poison,some algal blooms()can be dangerous for sea