A. It is a greeting of tapping each other's feet B. It is a greeting in which people do elbow bumps C. It is a greeting where social isolation happens. D. It is a greeting where air kisses are recommended 31. What can be the best title for the text A. The Impact Of COVID-19 On Living B Good News On COVID-19 Vaccines C Formal Greeting Ways Around the World D. No Handshake? No Problem D 下 new study suggests that dark markings on the planet Mars represent sand-not water. The research in 2015 suggested that lines on some Martian hills were evidence of water. Yet American scientists now say these lines appear more like dry, flows of sand. If water is present, it is likely to be a small amount Water in liquid form would be necessary for microbial(微生物的)ife NASA, the American space agency, said more research is needed. Michael Meyer is the lead scientist for NASAs Mars exploration programme. He noted that the latest study does not reject the presence of wa- ter. But he admitted. "It Just may not be as exciting as the idea of rivers going down the sides of cliffs 装 (悬崖 The new findings come from a team led by Colin Dundas of the United States GeologIcal Sunvey. His team measured 151 of these lines in 10 areas. Most of the lines end with slopes between 28 degrees and 35 degrees. These measurements are similar to active sand dunes(i F)on both Mars and Earth. A small covering of dust that moves and sometimes becomes lighter might help explain the markings. They usually ppear in the Martian summertime, and then disappear until the next year. If these lines are dry, this sug gests that recent Mars has not had large volumes of liquid water. Dundas and his research team say that many questions remain I still think that Mars has a great potential for having had life early on in its history, Meyer said As long as thats true, we also have a reasonable possiblity of life still being on Mars. It just happens to be cryptic or well hidden NASA currently has no robotic vehicle--either on Mars or in development-with the ability to climb steep slopes. The lack of such equipment has engineers coming up with ideas like Martian helicopters or thout p lots 32. What do American scientists find on Mars now according to their study? B. An amount of wate 线 A. A lot of little life C. Some Martian hills D. Dark markings are sand 33. When do the markings come out? B. In Martian summer. A. In Martian spring C. In Martian autumn D. In Martian winter 高一英语期末调研试题A-人教版-6(共10页) oo∩ova6sE OO AI QUAD CAMERA
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