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DAnother type,known as a transient or flash ripA blind fish living within a Mexican cavecurrent,forms when surf is choppy(波涛汹涌的).Thesystem's deep,enduring darkness still maintains阅读edges of breaking waves push on the water and makeit spin,like a fast ice skater crashing into someone.阅读some ability to sense light.As the cavefish nolonger seem to rely on an internal daily cycle andThink of a rip current as a swift river cuttingsome sleep very little,biologist Inga Steindal andthrough the surf away from the shore.Swimming第her colleagues were keen to see if their bodiesagainst the current is going to tire you out andcan still regulate cyclically through time.Most节put you at risk of drowning.Instead,swim parallel tothe beach-—think of heading for the“river banks'”-节animals on Earth have an internal clock for this,the circadian rhythm(昼夜节律)that uses lightuntil you are out of the rip current's pull.Once you'reno longer fighting it,you can swim back to shorelevels to make our bodies fit in with our planet'sday and night cycles.Rip currents aren't just a safety issue.Scientists arebeginning to better understand the crucial ecologicalThis rhythm is then used to cycle throughdifferent biological processes that can influence阅role they play in the ocean.Many marine organisms,including oysters,barnacles,fish and coral,rely onour behavior,such as our hunger cycles.ocean currents to find suitable habitats.These读The Mexican blind cavefish live in a complex of第organisms swim up or down or attach to floating or第over 30 isolated caves,within which they havesinking material and are transported by multiple oceaneach independently adapted to the dark.Theirprocesses.Rip currents are a key mechanism forbodies are extra sensitive to vibrations,allowing节carrying larvae (to deeper waters or recirculatingthem to sense changes in water currents forthem in shallow waters.The type and behavior of therip current may affect the movement of marinenavigation in compensation for their limitedorganismsor complete lack of sightThis adaptation occurred despite the fish from(C)8.What can we learn about channel ripeach cave evolving from the same species with fullycurrents according to the text?functioning eyes.This ancestral group still lives in傻A.They cause a bit huger waves than commoncurrents.阅读the surface waters in the El Albra region of Mexicoand some parts of the Southwestern US.第B.They form around deeper channels in theSteindal and her team took tissue samples fromsand bottom.第the blind cavefish,from three isolated caves,andC.They present visually as darker areastheir surface relatives and tested the cells in节between breaking waves.节different conditions.They detected the activationD.They are generated when two waves meet(激活)of several molecular(分子的)clockclose to the shore.mechanisms when the cells were exposed tolight,even in the cavefish cells.(D)9.What does the underlined word "transient""Non-visual light detection is maintained at ain paragraph 3 probably mean?fundamental cell-based level,"the researchersA.Dangerous.B.Powerful.explain,although the cavefish cells did not respond读C.Slow-flowing.D.Short-lived.读as strongly as those cells from surface fish.While(B)10.What suggestion does the author give onthere were some similarities between the fish fromescaping from a rip current?第the different caves compared to their surfaceA.Swimming with the current.relatives,there were also differences that confirm节B.Avoid swimming against the current节their biological clock changes each evolvedC.Swimming under the current.independently of one another via differentD.Avoid floating with the current.molecular mechanisms.(A)11.Why are rip currents important to theocean ecology?"We have provided proof that despite being阅读A.They redistribute small marine organisms.B.They provide habitats for marine阅读blind,cells from the Mexican blind cavefish candetect light and make their clocks fit in with a第organisms.light/dark cycle,"Steindal and her colleaguesC.They change the structure of marine第conclude.The team hopes these can help us learnecosystems.more about the circadian rhythm and provide an节D.They bring nutrients from the ocean's节easier way to study animal adaptations to darkbottom to the surface.environments.5