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child's sleep patterns or stress levels can help identify ways to deerease sleepwalkingSome families have members that sleepwalk into adthod but mostthatbhavoduring their teenage years.Keeping sleepwalkers safe is the most important part of the process28.What do we know about children's sleepwalking?A.Sleepwalking children sleep too much.B.Sleepwalking children only walk around.C.Examination anxiety can cause sleepwalking.D.Few children have the sleepwalking problem.29.What should be done with sleepwalking children?A.Calming them down.C.Waking them up.B.Following them.30.It is unnecessary for children to see a doetor when theyD.Leading them to bed.A.suffer a sleep disorderC.sleepwalk every other dayB.sleepwalk now and then31.What does the author intend to do in the last paragraph?D.get hurt in sleepwalkingA.Describe the treatment process.C.Provide some advice for the readers.B.Present some common examples.D.Introduce a new topic for discussion.DPlants cannot run or hide,so they need other strategies to avoid being eaten.Some curl up theirleaves,others produce chemicals to make themselves taste bad if they sense animals drooling onthem,chewing them up or laying eggs on them-all signals of an attack.New research now showssome floras can feel a plant-eating animal well before it launches an attack,letting a plant prepare apreemptive(先发制人的)defense that even works against other pest species..When ecologist John Orrock of the University of Wisconsin-Madison sprayed snail slime-a liquidthe animals release as they slide along-onto soil,nearby tomato plants appeared to notice.Theyincreased their levels of an enzyme(),which is known to prevent plant-eating animals."None ofthe plants were ever actually attacked,"Orrock says."We just gave them cues that suggested anattack was coming,and that was enough to cause big changes in their chemistry."Initially Orrock found this defense worked against snails;in the latest study,his team measuredthe slimy warning's impact on another potential threat.The investigators found that hungry caterpillars()which usually eat tomato leaves greedily,had no appetite for them after the plants wereexposed to snail slime and activated their chemical resistance.This nonspecific defense may be astrategy that benefits the plants by further improving their overall possibilities of survival,saysOrrock,who reported the results with his colleagues in March in Oecologia.The finding that a snail's approach can cause a plant response that affects a different animal madeRichard Karban curious,a plant communications expert,who was not involved in the study."It issignificant that the plants are responding before being damaged and that these cues are having suchfar-ranging effects,"Karban says.The research was comprehensive,he adds,but he wonders howthe tomato plants felt chemicals in snail slime that never actually touched them."That's the million-dollar question,"Orrock says.He hopes future research will make out themechanisms that enable plants to sense these relatively distant cues.32.John Orrock sprayed a liquid onto soil near tomato plants toA.make them grow betterB.give them a warningC.keep plant-eating animals awayD.inform plant-eating animals of danger33.Why is the example of“caterpillars'”mentioned in Paragraph3？A.To introduce another animal.B.To confirm the result of the study.C.To appeal to people to protect animals.D.To analyze different resistance chemicals【2023届高三②联·英语第5页（共8页）】

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