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Thetio fhoea the most humane oom for this bear,"said one of thebiologists.Wh the policfcothe i do?A.Avoid mixing food leftovers with garbage.B.Replace small windows with biggernsC.Call the police once they see Hank the Tank.D.Put foodoutside to help the trapping effort.25.Where was the Safeway Bear sent?A.El Dorado County.B.Kings Beach.C.Catalina Drive.D.Lake Tahoe.26.What can be learned about the Safeway Bear?:意若地铁A.It had a hard life in the Tahoe area.B.It lost its ability to live in the wildC.It successfully got used to a natural diet.D.It stole food and killed people on the beach.27.What is the biologist's attitude to the action of the shooter?A.Opposed.B.Skeptical.C.Supportive.D.Unconcerned.CWhen we're thirsty,we drink.It seems so simple.But the science behind that decision isamazingly complex,a Caltech researcher reports in the journal Nature."There are many thirst-related checkpoints throughout the body and brain,"says Yuki斟Oka,the author.One of the first checkpoints is passed when water reaches our mouth,which gives ourbrain a refreshing feeling.Then our brain needs to know how much water we are taking in tofigure out when we should stop.It can't wait until the water is absorbed into the bloodstream区because that can take 15 minutes or more.So the body has an additional checkpoint,which isswallowing.The act of swallowing acts like a meter,which the brain monitors to quickly数determine how much water is entering the body."Still,the brain takes a complex trust-but-confirm approach to this information and the病confirming process takes a couple of minutes,"Oka says."Cells near the liver()also sendmessages to the brain when we are drinking.These cells aren't sensing the water directly.Experiments show they are responding to a chemical that's produced when water makes the知blood less salty.In a matter of minutes,the change is translated into more sensitive chemicalsignal to tell the brain the exact changes."The checkpoint near the liver is not the final one.There's then going to be changes inblood pressure along the intestine(which can be sensed as well,the study reports."All of these complex multiple checkpoints to regulate thirst can be expected,given thelife-or-death nature of our dependence on water.However,it just shows how complex anapparently simple process actually works in our body,"Oka says.28.Where is the checkpoint that roughly measures the amount of water we drink?A.In the mouth.B.In the throat.C.Along the intestine.D.Near the liver.29.How many thirst-related checkpoints are mentioned?B.Three..Four.D.Five.诗烟等四A.Two.30.How does Yuki Oka feel about the discovery?A.Surprised.B.Confused.C.Encouraged.D.Overjoyed.【高三英语试题第4页（共8页）】223551D