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Cgive off methane from their trunks. Then,he wanted to study its release from trees in driersoils. “We were surprised to see the exact opposite,” says Gauci, The trees were actuallytaking in methane.Trees taking in and releasing gases is gas exchange. Researchers typically measuremethane exchange low on the trunk,near the ground. But Gauci’s team measured higher upon the tree, thinking this would better estimate how much methane the whole tree might sendout.Gauci’s two students measured methane release from trees in the UK and Panama,题setting up a gas-exchange chamber on a tree to monitor how much methane it's absorbing orsending out. They expected methane emissions （排放） would drop as they measured higher upthe trunkTheir guess at first seemed to hold.Higher up the trunk,methane release dippedTo further check their findings, the team analyzed trees from four regionsBrazil,Sweden,Panama and the UK. The result was the same at all sites. Overall, the trees took upmore methane than they released. Using data from the four sites, the team estimated all theworld's forests may be absorbing 50 million tons of methane every year.内The scientists believe methane is taken in by microbes that live in tree bark. On average,trees absorbed more methane than they released, with faster uptake in warmer climates.Gauci says,“People release far more methane than what nature can remove. So we haveto cut back on fossil fuels. Trees are even more important for climate than we thought. We28. What aspect of the research surprised Gauci?弥A. Its theory.B. Its process.C. Its findings.D. Its functions.29.What can we learn from the research?A. Its data was measured globally.B. It was done by Gauci and his coworkers.C. Its participants were the same as before.D. It involved methods different from typical ones.30.What do Gauci's words in the last paragraph show?A.Protecting trees is crucial.B. Trees can remove all methane.C. Methane has no natural sources.D. Methane is important to climate.【高三英语第5页（共10页）】注意：