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If you've ever waded into thecen for a swim and suddenly realized that the shore isgetting farther away,not closer,you may have encountered a rip current().Commonat beaches worldwide,these powerful urenofrom the shore toward the sea at speeds upto several feet per second.It's important to know what rip currents are and how to look for them,because they area leading cause of drownings in the surf one near shore.Rip currentsn form in severalways.One type of rip current,known as a channel rip current,forms when there are gapsbetween breaking waves.As waves break,they push water toward the beach and raise thelevel of the water slightly.If waves break on a sandbar(),but not in a deeper channelthat cuts through the sandbar,the extra water that the waves have pushed toward the beachescapes back to the ocean through the channel.The darker corridor of the escaping water actslike a conveyor belt,moving water,unsuspecting swimmers and small marine organismsoffshore.Another type,known as.a transient or flash rip current,forms when surf is choppy()The edges of breaking waves push on the water and make it spin,like a fast iceskater crashing into someone.Think of a rip current as a swift river cutting through the surf away from the shore.Swimming against the current is going to tire you out and put you at risk of drowning.Instead,swim parallel to the beach-think of heading for the "river banks"until you are out of therip current's pull.Once you're no longer fighting it,you can swim back to shore.Rip currents aren't just a safety issue.Scientists are beginning to better understand thecrucial ecological role they play in the ocean.Many marine organisms,including oysters,barnacles,fish and coral,rely on ocean currents to find suitable habitats.These organismsswim up or down or attach to floating or sinking material and are transported by multipleocean processes.Rip currents are a key mechanism for carrying larvae()to deeper watersor recirculating them in shallow waters.The type and behavior of the rip current may affectthe movement of marine organisms.28.What can we learn about channel rip currents according to the text?A.They cause a bit huger waves than common currents.B.They form around deeper channels in the ocean's bottom.w133AC.They present visually as darker areas between breaking waves.gatinio9qeiQ○D.They are generated when two waves meet close to the shore.29.What does the underlined word"transien"in paragraph 3 probably mean?A.DangerousB.Powerful.C.Slow-flowingD.Short-lived.英语试题（长郡版）第6页（共12页）
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