Just like a voyage at sea, our life, ______ days are limited, is full of uncertainties. [ ]A. whichB

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• He made another wonderful discovery, ________ of great importance to science.[ ]A．which I think isB．
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• The song In Spring has brought national fame to Xuriyanggang，________ won the second place in the 20
• 植物体中导管的作用是运输水和无机盐，运输方向是自______而______．-七年级生物
• 根能够不断生长的原因是（）A．分生区不断地增加新的细胞B．伸长区的细胞不断地伸长C．根冠不断地增加新细胞D．分生区细胞不断地分裂出新细胞，伸长区细胞不断地伸长-七年级生物
• 植物茎的结构中，具有输导功能的是（）A．木纤维B．韧皮纤维C．形成层D．导管和筛管-生物
• 植物体内水分的运输依靠导管，无机盐的运输依靠筛管．______．-生物
• At home, he never seems to have time until after 10:30 pm, ________ his children have gone to bed.[
• Clean water and fresh air are essential for our daily life, _______ we can't live.[ ]A. by whic
• 观察如图（1）图1表示______，其功能是______．（2）图2表示______，其功能是______．-七年级生物
• 橡胶树通过割皮可获得橡胶制品的原料--白色乳汁状的液体．若右图表示橡胶树茎的切面，请问乳白色的液体是从图中的什么部位流出来的（）A．a与cB．b与cC．aD．c-生物
• 茎中的导管是运输水分的管道，导管是由一个细胞构成的．______．-生物
• 下列说法不正确的是（）A．茎中的导管是运输水分和无机盐的管道，导管是由一个细胞构成的B．植物体内的有机物通过筛管运输C．气孔能张开与闭合，主要是通过保卫细胞来控制的D．蒸腾-生物
• Many grocery stores use misting, a process ________ vegetables are sprayed with water, to keep veget
• 植物运输水分和无机盐的主要器官是（）A．导管B．筛管C．根毛D．茎-七年级生物
• It was on July 1, 2006 ___ Qinghai-Tibet railway began operation, ____ is a symbolic project inChina
• 在绿色开花植物体内，运输水分和无机盐的是导管…______．-生物
• Huge amounts of oil have been found on the Gulf of Mexico floor, the effects of _____ are still bein
• "You'll have to wait for two hours, _____is, at about 11:30, _____ the medical report will
• 下列关于导管和筛管的叙述中，错误的是（）A．同位于根、茎、叶中B．同属于输导组织C．都有输导作用D．都是死细胞-生物
• 俗话说“梨树砍三刀，树枝压弯腰”，其丰产的道理是（）A．限制了水分和无机盐向根部运输B．防治了害虫的侵害C．限制了有机物向根部运输D．限制了水分和无机盐向茎叶运输-七年级生物
• 把带叶的枝条插到红墨水中，放到温暖有阳光的地方，等叶脉变得微红时，取出枝条，用清水冲干净，用刀片横切茎，看到许多红色小圆点，这些小圆点存在于（）A．韧皮部B．树皮C．形成-七年级生物
• 植物运输水分的方向是（）A．由上往下B．由下往上C．由左往右D．由右往左-生物
• I shall never forget the days _____ I spent in Beijing University, _____ has a great effect on my li
• We would like to take this opportunity to thank our partners, without ________ we would not be able
• The engineer spoke highly of the government's efforts, _____he owed his safe return from Libya.
• We are getting our degree soon, _____also announces the end of our college life. [ ]A. that B. which
• Putting a candle in the window _____a traditional practice in many cultures, _____has a variety of m
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• Between the two parts of the concert is an interval，________ the audience can buy icecream.[ ]A．when
• There are quite a few good books here, some of _____I can recommend to my students. [ ]A. those B. t
• Everyone will go through life's stages of ups and downs, _____self-respect plays a key role in
• Jim passed the driving test, ____________ surprised everyone in the office.[ ]A.whichB.thatC.thisD.i
• He is working hard, _____ will make him pass the final exam. [ ]A. that B. which C. for which D. who
• The scientists all agreed that rules of physics, ______ we are allfamiliar, govern the world.[ ]A.to
• 植物体内运输有机物的结构是（）A．筛管B．导管C．形成层D．胞间连丝-七年级生物
• This machine, _____ for many years, is still working perfectly. [ ]A. after which I have looked B. w
• The settlement is home to nearly 1,000 people, many of _____left their village homes for a better li
• 导管是由一个细胞构成的．______．-生物
• 橡胶树我们美丽的海南岛的一种重要的经济林，用一定的方式对橡胶树进行割皮处理，就能收获工业上橡胶制品的原料，即白色乳汁状的液体．流出乳白色液体的结构是（）A．树皮B．导管-生物
• Luckily he is going to attend Qinghua University, _____ his sister graduated last year.[ ]A. thatB.
• 如图为茎的输导功能示意图，①-④所示箭头能正确代表物质运输方向的是（）A．①③B．②③C．①④D．②④-生物
• The last time they went to Scotland was in May，________ the weather was beautiful.[ ]A. thatB. whenC
• 如图是植物的导管和筛管，甲为______；乙为______．甲的作用是______，乙的作用是______．-生物
• We have four classes in the morning, and ______ every two classes, there is an internal, ______ we c
• In our factory there are 2,000 workers, two thirds of _____ are women. [ ]A. them B. which C. whom D
• 掐断植物的嫩茎，断面流出的汁液主要来自（）A．细胞液B．导管中的运输物C．筛管中的运输物D．树干上的露水-生物
• 2009年春，我县提出：创建省级园林城市，营造绿色宜居家园。绿化工人在移栽树苗时，其根部总是带有一个大的“土坨”，下列有关解释不正确的是：[]A．防止秧苗的幼根和根毛受到损伤-七年级生物
• By serving others, a person focuses on someone other than himself or herself, ____ can be very eye-o
• 一棵小樟树，由于主干部位拴了一根凉衣的铁丝，几年后便死去了，这铁丝的影响主要是（）A．阻断了有机物的向上运输B．阻断了有机物的向下运输C．阻断了水分、无机盐的向上运输D．阻-生物