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BThe world becomes a better place when we not only recognize that everyone has bad days,but when we alsocare enough to act accordingly.No matter what kind of bad experience we experience,we should treat it actively.Fourth-grade teacher Rachel Harder recognized this,and she found an amazing way to help out both her studentsand their families.A few years ago,the Kansas teacher attended a trauma (conference.She learned that some policestations partner with schools so they can let teachers know when one of their students has a police encounter,something that could cause them to need extra care or attention.A year after the conference,Rachel had a studentwith autism (who frequently had tough days.To support the student,Rachel told his mom to simply texther "handle with care"to let her know when it was going to be one of those days.The simple method was such a success that Rachel decided to send all her students home with a note for theirparents.It explained what the"Handle with Care"system was and how they could take advantage of it.In no time,parents began to show their appreciation for Rachel's incredible act of kindness.But Rachel's sympathy didn't endwith her class.Word spread of the amazing system,and teachers across the country began giving it a shot in theirown classrooms.Printouts can be found on the Smart School House website,and the feedback has been extremelypositive!Even though teachers can sometimes tell when a student is having a tough day just by the way they're acting,Rachel said these simple texts allow educators to make minor adjustments in advance that,in turn,make the wholeday better for everyone."It's important for me to give kids a few minutes of extra time or space,"she said,"and it'seasy to give."4.What does the underlined word "this"in paragraph 1 refer to?A.The tough time in life.B.The beauty of nature.C.A positive attitude to hardship.D.An extreme working style.5.How did Rachel help the student with autism?A.By supporting him to do what he wants.B.By discussing his trauma in a conference.C.By knowing his state at home from his mother.D.By getting assistance from some police stations.6.Why did Rachel send notes to the parents of all her students?A.To prove the behavior is efficient.B.To inform the parents of her method.C.To explain the kindness to the parents.D.To gain the parents'sympathy for herself.7.Which of the following can best describe Rachel?A.Curious and courageous.B.Energetic and grateful.C.Humorous and warm-hearted.D.Responsible and considerate.【答案】4.C5.C6.B7.D【解析】【导语】本文是一篇记叙文。Rachel老师通过让学生家长发送短信“小心处理”给她，暗示学生在家有状况需要呵护，提前做好帮助学生渡过难关的准备，这种方式获得家长的积极反馈，并被全国各地的老师效仿。【4题详解】词义猜测题。根据第段“No matter what kind of bad experience we experience,.we should treat it actively.Fourth-grade teacher Rachel Harder recognized this,and she found an amazing way to help out both her studentsand their families.(不管我们有过什么糟糕的经历，都要积极的去面对。Rachel意识到了这一点，她找到了一个神奇的方法来帮助她的学生和他们的家庭)”可知，hs指代上一句中的“指积极面对困难的态度”。故选C。【5题详解】细节理解题。根据第二段“To support the student,,Rachel told his mom to simply text her handle with care'to lether know when it was going to be one of those days.(为了支持这名学生，Rachel告诉孩子的母亲，当孩子出状况的时候。只要给她发短信“小心处理”即可)”可知，Rachel是通过这个家有自闭症的学生的母亲了解他在家的情况来帮助这个学生。敌选C。【6题详解】推理判断题。根据第声段第一句“The simple method was such a success that Rachel decided to send all herstudents home with a note for their parents.It explained what the 'Handle with Care'system was and how theycould take advantage of it..(这个简单的方法非常成功，Rachel决定让她所有的学生回家时带上写给他们的父母一张便条。它解释了什么是“小心处理”系统，以及他们如何利用它。)可知，老师给家长便条是为了告知家长她的方法，故选B。【7题详解】推理判断题。“To support the student,Rachel told his mom to simply text herhandle with care'to let her knowwhen it was going to be one of those days.(为了支持这名学生，Rachel告诉孩子的母亲，当孩子出状况的时候。只要给她发短信“小心处理”即可)”和第三段“The simple method was such a success that Rachel decidedto send all her students home with a note for their parents.(这个简单的方法非常成功，Rachel决定让她所有的学生回家时带上写给他们的父母一张便条)及最后一段“Even though teachers can sometimes tell when a studentis having a tough day just by the way they're acting,Rachel said these simple texts allow educators to make minoradjustments in advance that,,in turn,make the whole day better for everyone.(Rachel说，尽管老师有时可以通过学生的表现来判断他们什么时候过得不好，但这些简单的短信可以让老师提前做一些小小的调整，从而让大家的一整天都过得更好)”可知，Rachel关心班上的每个学生，对学生负责、体贴。故选D。

CMetaphorically speaking,the vast tropical rainforest in South America's Amazon River basin is often calledthe"lungs of the planer".Some people claim that the Amazon Rainforest alone is responsible for 20 percent ofEarth's oxygen,but is this really true?As the region experiences more fires in 2019 than it has seen in almost adecade,some people are wondering what would happen to Earth's oxygen supply if the whole of the Amazon wereto burn away.Would Earth actually lose 20 percent of its oxygen,or are there other unexpected consequences thatwould await us instead?Relationships between tropical forests and oxygen are complicated.Growing plants produce oxygen,andtropical rainforests are huge contributors,but dead and rotting plants-as well as burning plants--consume oxygento release carbon dioxide as a by-product during decomposition and combustion ()Often the ratio between aplant producing oxygen in life and consuming oxygen in death is 1:1,so many atmospheric scientists don't see theAmazon,or even Earth's forests as a whole as net oxygen producers,because all plants die sooner or later.Instead,Earth's oxygen mainly comes from marine algae (Marine algae bloom in the oceans,sting onthe surface and taking advantage of the nutrients that are stirred up in seawater and pulling in carbon dioxide fromthe atmosphere.While algae live.they use carbon dioxide to grow,and they release oxygen into the atmosphere.However,when they die,algae do not decompose on the ocean surface,so they do not draw from the atmospherethe same amount of oxygen that they produce in life.Instead,algae sink.Some dead algae consume oxygendissolved in seawater and largely or completely decompose as they sink,releasing the carbon stored in their bodiesinto the water.However,others sink deep enough fast enough that they fall below the ocean's oxygenated layersbefore they decompose in earnest.They land on the ocean floor almost completely,so the carbon in their bodiesstays put.Over millions of years,this process results in a net oxygen gain in Earth's atmosphere.Burning the Amazon won't have a significant effect on oxygen levels,but it is warned that burning will addenormous amounts of carbon dioxide to the atmosphere,which will further strengthen global warming and producemore severe climate changes.And there are other very serious long-term consequences to destroying Earth's mostbiodiverse region.8.Why does the writer mention"unexpected consequences"in paragraph 1?A.To convince the readers of topical forests'importance.B.To inform the readers of other discoveries about tropical forests.C.To argue against the "lungs of the planet"metaphor.D.To present a more balanced view on the importance of tropical forests9.Why won't the destruction of Amazon have much impact on the planets oxygen level?A.The oxygen consumed by the dying plants cancels out what they produce in life.B.The plants in Amazon Rainforest tend to disappear before they are fully grown.C.Tropical forests have a complex relationship with oxygen generation.D.Carbon dioxide is only a by-product of the proeess of decomposition10.What makes marine algae a net oxygen contributor as a whole?A.That marine algae produce more oxygen than plants.B.That some dead marine algae don't break down.C.That marine algae spread fast in the ocean.D.That some dead marine algae don't reach the ocean bottom.11.What can be another useful feature in some marine algae's death?A.Mineral accumulation.B.Carbon fixation.C.Water purificationD.Marine nutrition.【答案】8.D9.A10.B11.B【解析】【分析】这是一篇说明文。文章介绍了热带雨林并不是地球的净供氧体，真正的净供氧体是海洋中的藻类【8题详解)推理判断题。根据第二段关键句“Often the ratio between a plant producing oxygen in life and consumingoxygen in death is 1:1,so many atmospheric scientists don't see the Amazon,or even Earth's forests as a whole asnet oxygen producers,.because all plants die sooner or later.”(通常情况下，植物在生命中产生氧气和在死亡时消耗氧气的比例为1：1，因此许多大气科学家并不认为亚马逊雨林，甚至整个地球的森林都是净氧气的产生地，因为所有植物迟早都会死亡。)可知，下文展示了科学家的一种新的观点，植物在生命中产生氧气和在死亡时消耗氧气的比例为1：1，因此亚马逊雨林，甚至整个地球的森林并不是净氧气产生地，它们对地球的氧气含量没有显著影形响，这是对热带森林的重要性更平衡的看法，由此可推断出，作者在第1段中提到“意外后果”是为了提出下文对热带森林的重要性的更平衡的看法。故选D项。【9题详解】细节理解题。根据第二段关键句“Growing plants produce oxygen,,and tropical rainforests are huge contributors,.but dead and rotting plants-as well as burning plants-consume oxygen to release carbon dioxide as a by-productduring decomposition and combustion ()Often the ratio between a plant producing oxygen in life andconsuming oxygen in death is 1:1,so many atmospheric scientists don't see the Amazon,or even Earth's forests asa whole as net oxygen producers,because all plants die sooner or later..”(生长中的植物产生氧气，热带雨林是巨大的贡献者，但死亡和腐烂的植物以及燃烧的植物消耗氧气，在分解和燃烧过程中释放出副产品二氧化碳。通常情况下，植物在生命中产生氧气和在死亡时消耗氧气的比例为1：1，因此许多大气科学家并不认为亚马逊雨林，甚至整个地球的森林都是净氧气的产生地，因为所有植物迟早都会死亡。)可知，生长中的植物产生氧气，在分解和燃烧过程中消耗氧气，在生命中产生氧气和在死亡时消耗氧气的比例为1：1，相互抵消了，因此，亚马逊的毁灭不会对地球的含氧量产生很大影响，由此可知，亚马逊的毁灭不会对地球的含氧量产生很大影响，因为濒死植物消耗的阐氧气抵消了它们在生命中产生的氧气。故选A项。【10题详解】推理判断题。根据第三段关键句“However,.when they die,algae do not decompose on the ocean surface,so theydo not draw from the atmosphere the same amount of oxygen that they produce inlife.Instead,algae sink.Somedead algae consume oxygen dissolved in seawater and largely or completely decompose as they sink,releasing thecarbon stored in their bodies into the water.However,others sink deep enough fast enough that they fall below theocean's oxygenated layers before they decompose in earnest.They land on the ocean floor almost completely,sothe carbon in their bodies stays put.Over millions of years,this process results in a net oxygen gain in Earth'satmosphere.”(然而，当藻类死亡时，它们不会在海洋表面分解，因此它们从大气中吸收的氧气量与它们在生命中产生的氧气量不同。相反，藻类会下沉。一些死亡的藻类消耗溶解在海水中的氧气，在下沉时大部分或完全分解，将体内储存的碳释放到水中。然而，另一些则沉得足够深，沉得足够快，以至于它们在真正分解之前就落到海洋的含氧层之下。它们几乎完全降落在海底，所以它们体内的碳元素保持不变。数百万年来，这一过程导致地球大气中的氧气净增加。)可知，当藻类活着时，会产生氧气，当藻类死亡时，它们不会在海洋表面分解，因此不会消耗空气中的氧气，正因为这样，它们成为净供氧体，由此可知，海藻成为净供氧体是因为一些死去的海藻不会分解。故选B项。【11题详解】推理判断题。根据第三段关键句“However,,others sink deep enough fast enough that they fall below the ocean'soxygenated layers before they decompose in earnest.They land on the ocean floor almost completely,so the carbonin their bodies stays put.Over millions of years,this process results in a net oxygen gain in Earth's atmosphere.(然而，另一些则沉得足够深，沉得足够快，以至于它们在真正分解之前就落到海洋的含氧层之下。它们几乎完全降落在海底，所以它们体内的碳元素保持不变。数百万年来，这一过程导致地球大气中的氧气净增加。)可知，当藻类死亡时，它们中的一些几乎完全降落在海底，所以它们体内的碳元素保持不变，具有碳固定性，由此可知，某些海藻死亡的另一个有用特征是碳固定。故选B项。