【正文】 造成的，通常被稱為霧天；相對濕度介于80%90%之間時的空氣能見度惡化是霾和霧的混合物共同造成的，一般被統(tǒng)稱為霧霾天。④霧和霾常常相伴出現(xiàn)。③霾是空氣中的灰塵、硫酸、硝酸、有機碳氫化合物等粒子使大氣渾濁，并導致水平能見度小于10000米的現(xiàn)象。②霧是大量懸浮在近地面空氣中的微小水滴或冰晶導致水平能見度降低到1000米以內(nèi)的天氣現(xiàn)象?！币痪渲小皩θ祟惗浴蹦芊袢サ?為什么?第③自然段中畫橫線的句子使用了、的說明方法。（）（4）文中加雙引號的詞句較多，這些引號的作用都是表示特殊含義。（）（2）第②自然段是過渡段，在文中起到承上啟下的作用。土白蟻的特點是土白蟻是如何造成堤壩在汛期出現(xiàn)險情的?（用波浪線在文中畫出）下面的說法是否正確，對的畫“√”，錯的畫“”。④土白蟻對人類而言是一種有害昆蟲，要徹底消除它的危害并非易事。一旦汛期來臨，水位高漲，水流溢入蟻道、蟻穴，就會出現(xiàn)堤壩管涌、滲漏和滑坡等險情。土白蟻的巢穴在地下可深達兩米，主巢大約1－2立方米，主巢周圍的副巢常有百余個，巢穴之間有四通八達的蟻道相連，就像是人類的住宅小區(qū)。一個成年蟻巢內(nèi)的幾百萬只白蟻在一起過著“有組織、有紀律”的群體生活。破壞堤壩的白蟻主要是土棲性白蟻，即專在土中筑巢的一類白蟻。荊江大堤上飛馳的小吉普竟然全車陷落在土壩中，至于行人、水牛跌入壩中“陷阱”情形就更是屢見不鮮了。土白蟻行蹤詭秘，為害隱蔽。1998年長江流域遭遇特大洪水，一些堤壩出現(xiàn)“涌”就是蟻害所致。在第②自然段的括號內(nèi)填入合適的關(guān)聯(lián)詞。聯(lián)系上下文，理解下列詞語的意思。它之所以能使人年輕，是因為它能強化肌肉、血管、結(jié)締組織、骨骼及軟骨、牙齒的活力，尤其能增強血管的彈性和結(jié)締組織的活力?！币馑际钦f，常咽唾液可以健康長壽。唾液能讓發(fā)霉食物中的致癌毒性物質(zhì)幾乎全部消失。唾液中所含的溶菌酶對強烈致癌的黃曲霉素、亞硝胺等有很好的解毒作用。④近年來，醫(yī)學家們發(fā)現(xiàn)唾液對污染食物中的致癌物具有消毒作用。口腔里的傷口往往比其他地方好得快，拔牙或牙齦手術(shù)后很少發(fā)生感染，主要原因就在于唾液中的溶菌酶有殺菌的能力，可阻止口腔內(nèi)細菌大量繁殖。而這種“潤滑油”一旦失去的話，舌頭就會和上顎或者下顎的表皮粘在一起，于是我們口腔內(nèi)的一整套“機械”也就只好“束之高閣”了。②唾液的作用很多，我們的口腔里（）沒有唾液，咽不下食物是不必說的，（）連嘴巴恐怕也張不開。唾液腺雖小，卻是個很勤快的器官，一個成年人，一晝夜間可以分泌出10001500毫升唾液。第三篇：小升初語文說明文閱讀理解專項訓練卷小升初說明文閱讀理解專項訓練卷（一）奇妙的唾液①唾液，俗稱口水、口涎，它是口腔內(nèi)各種腺體所分泌的黏稠狀液體。此處意為：他們在上午有四節(jié)課，故應(yīng)用have,即D選項。在英語中，具體時間點的前面應(yīng)用介詞at，故選擇B選項。此處為泛指，且前有many修飾，故應(yīng)用可數(shù)名詞復數(shù)friends ,即C選項。，且后面詞是以非元音音素開頭，故選擇A選項。文中曾提及在這個男孩家中有三個人，說過了爸爸，這時提到的肯定是媽媽，故選擇C答案?！霸诩彝ブ小钡挠⑽谋磉_為“in the family”，故選擇B選項。Let’s look at boy’s name is are three people2his works in a bank(銀行)and his4is a teaches ’s5in6Japanese has many class begins8eight o’ lessons in the morning and two lessons in the10.(C)(B)(A) (C) (A) Grade Two Two Grade two grade two(A)D./(C) friend friends(B)(D)(B) 。 going to +V原形，表示按計劃或打算要做某事。，其結(jié)構(gòu)是：主語+be+ Turner 和Mrs Turner兩人。Many只能接可數(shù)名詞的復數(shù)形式，little 后接不可數(shù)名詞但表示否定意義。Be from=e from表示“來自?”+大地方，表示“在??”。others are sweeping the Hua is putting up a map on the is a map of Fei and Wei Qing are mending some broken children are listening to the radio while they are classroom looks nice and bright after the children are very go home for lunch at noon.（） children are playing in their classroom on Sunday morning.（） Huang, their mother, is working with them.（） is a map of China on the wall.（） of them are repairing the broken chairs.（） are singing while they are working.第二篇：小升初英語專項訓練 完形填空26小學升外國語學校英語完形填空專項5026The are is their first visit to are going to stay in China3three want to visit some big cities and hope to learn4Chinese , is a drive in Turner is a school city school and a village is a middle school meets some Chinese lot of pictures in they are back in America, they9show the pictures to their want10to know more about China.(B) from from(D)(C)(A)(B)(C) visiting(D)(C)(D) to wanting visiting going to going to(B) American people America +姓的復數(shù)，表示一個人，夫婦。s Sunday students of Class 3 are giving their classroom a good Huang, their teacher, is working with children are are carrying water。（） Shan and Yang Ling visited Lin Tao’s grandparents last Sunday.（） the farm, Yang Ling planted trees.（） Tao’s grandma cooked a nice lunch.（） Ling and Su Hai planted flowers.（） worked on the farm for about two week, the animals had a sports Beibei and Ant Lele had the weight Lele is smaller and thinner, he lifted much heavier things than his body, so he won(獲勝).Next, Rabbit Benben and Tortoise(烏龜)Xiaobai had a thought(想)himself would be the winner(獲勝者).He laughed at Xiaobai, “Follow me, slower guy?” He ran as fast as he could until(直到)he couldn’t see Xiaobai.“Let me have a rest,” he said to himself and slept under a big treet know to wash sheets to make his bed to clean sheets his sheets are（） father says his son is _____ because he doesn39。t know? You need to take care of your things.”“Where are Jack39。s time for you to are your clean sheets(床單)?”“I don39。s unfair(不公平)， wants me to make my bed, but I don39。第一篇：小升初英語閱讀理解專項訓練閱讀理解專項訓練People are busy working every do not have enough time to do many people bee too fat or too need to do exercise to keep are many kinds of and stretching helps us move we play ball games or swim, we shall do bending and stretching exercise kind of exercise is sometimes called warmup is also good we cannot run fast, we can means running , before we run or jog, we must do some warmup , we should not run or jog in busy is not safe and the air there is often dirty.（） many people too fat or too too much too much no time to do exercise too much exercise（） we play ball games, we must warmup exercise（） does jogging mean ? means bending and means warmup means running means running slowly.（） of the following sentences is RIGHT ? shouldn’t be busy are not many kinds of exercise to keep means running streets are not good places for running.（） of the following sentences is WRONG ? have no time to do exercise because their work is very can do some warmup exercise to run cannot jog in busy streets because it is shall do bending and stretching exercise to warmup our body before we do Smiths like to go out for a trip on Sunday they want to go to the West and Mike, the sons, get up very early in the puts on a shirt and jeans, and Mike puts on a Tshirt and also put o