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center of Andromeda and Sagittarius a sinking into the center of the newlycombined galaxy."Before now,we didn't even know if supermassive black holes merged,and now we have evidence that hundreds of thousands of them are merging,said Chiara Mingarelli,another member of Nanograv.If scientists understand more about the history of the mergingsupermassive black holes,it could help know how they form in the first placesaid Masha Baryakhtar,a physicist who wasn't involved in the research.32.What stopped scientists from studying black holes?A.Black holes were too far away.B.There were no ways to observe them.C.Black holes were too supermassive.D.People did not care to know them more.33.What is the main topic of Paragraph 2?A.The causes of black holes'merging.B.The knowledge of gravitational waves.C.The function of gravitational waves.D.Two breakthroughs on black hole study.34.What may support the evidence mentioned by Chiara?A.The actual detection of gravitational waves.B.Black holes consuming light and matter.C.Objects moving with mass cause gravitational waves.D.The merging of Andromeda and Sagittarius A.35.What may be the best title of the text?A.Black Hole in Our Galaxy Is.on Crash CourseB.Gravitational Waves Were First DetectedC.The End of Universe Goes to Black HolesD.Black Holes Merge to Form New Worlds第二节(共5小题:每小题2.5分,满分12.5分)阅读下面短文,从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。Getting sunburned from the Ultraviolet rays(UV,紫外线),no matter whatyour age is,is a risk factor for skin cancer.36.And while usingsunscreen(防晒霜)whenever you're spending time in the sun is key amongsun safety strategies,other measures matter,too.Here are tips from the sunsafety experts on how to keep your skin burn-free and healthy.1.Use sunscreenOnly about 19 percent of older men and 32 percent of older womenreport regularly using sunscreen,according to a 2019 study.But everyoneshould apply it to exposed skin whenever they'll be outside,even on cloudy7
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