Huge amounts of oil have been found on the Gulf of Mexico floor, the effects of _____ are still bein

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• 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
• 导管是植物水分在______内的运输途径，每一根导管是由许多______、______的细胞组成，上下细胞间的______消失，形成了一根______的管道．植物根、茎、叶中的导管是______的，-
• 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
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• 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
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• 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
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• 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
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• 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
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• 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
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• 植物吸收水分和无机盐、运输水分和无机盐的结构分别是（）A．根毛筛管B．根毛导管C．筛管根毛D．导管根毛-生物
• 关于下列植物体内物质运输的说法正确的是（）A．韧皮部内有导管，木质部内有筛管B．导管运输有机物，筛管运输水和无机盐C．导管和筛管把营养物质运输到各部位的细胞D．导管和筛管只-七年级生物
• 如果树木主干上的树皮被环剥一圈，树木将会死亡，原因是（）A．根吸收的水和无机盐不能运输到枝和叶B．叶制造的有机物不能运输到根C．根吸收的有机物不能运输到枝和叶D．木质部得不-七年级生物
• 下列有关植物知识的叙述中，正确的是（）A．马铃薯块茎中的有机物是由叶制造并由导管运输而来的B．“小麦清明拔三节”是对居间生长的描述C．被子植物的胚中两片子叶D．植物的呼吸作用-生物
• 俗话说“人要脸，树要皮”，这是因为在树皮中有重要的输导组织--筛管，它可以将植物叶片制造的有机物按照从上往下的方向输导．______．-生物
• 小明不小心折断树枝，发现有的小管子流的是水，有的流的是象牛奶一样的物质，那么里面流水的是______管；牛奶一样的物质是______，运输它的是______管．-生物
• As a child，Jack studied in a village school，______ is named after his grandfather．[ ]A．whichB．whereC
• 移栽植物应尽量在幼苗期，而且要带土移栽，这是为了[]A．减少水分散失B．减少根和根毛的折断C．防止营养流失D．防止植物不适应环境-七年级生物