_____is known to all,China will be an_____ and powerful country in 20 or 30 years' time. [ ]A.

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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
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• 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
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• It was on July 1, 2006 ___ Qinghai-Tibet railway began operation, ____ is a symbolic project inChina
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• 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
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• 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
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• Jim passed the driving test, ____________ surprised everyone in the office.[ ]A.whichB.thatC.thisD.i
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• 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
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• Luckily he is going to attend Qinghua University, _____ his sister graduated last year.[ ]A. thatB.
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• The last time they went to Scotland was in May，________ the weather was beautiful.[ ]A. thatB. whenC
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• 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
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