If you often feel tired and can't focus your attention, that is________you have to stop working

更多内容推荐

• 我国大陆第一个试管婴儿的缔造者是张丽珠教授，这项生物技术是目前应用最广的生殖辅助技术，这种技术的特点是（）A．无性生殖、体外受精、体内发育B．无性生殖、体内受精、体内发-生物
• Tomsayshecanbeequaltothistask.That's________Idisagree. [ ]A.where B.what C.when D.why-高三英语
• As I don't know _____ to take up Miss Rose's course because of her wedding leave, I haveto
• Country life gives him peace and quietness , which is ______ he doesn't enjoy living in big cit
• 在横线中填写有关名称完成植物有性生殖过程图：-生物
• 下列新个体的获得与“多利”羊出生原理不同的是（）A．插柳B．压条获得的石榴树C．种子萌发后长成的菜豆D．单细胞培养的胡萝卜-生物
• The terrible earthquake took place early this month ______ three southern countries meet.[ ]A. where
• -Has she agreed to the date for the meeting?-Well, that's _____ she disagrees. [ ]A. whatB. whe
• —Hi, Peter. You seem to have gained a lot of weight.— Well, good food, not enough exercise. That
• 下列繁殖方式中，全属于有性生殖的一组是（）A．水稻的种子繁殖和红薯的块根或薯藤（茎）的繁殖B．袁隆平利用野生稻杂交培育出杂交水稻和小麦C．大白菜的菜籽播种和优良苹果树的嫁接-生物
• _____ some mammals came to live in the sea is not known.[ ]A. WhichB. Since C. AlthoughD. How -高一英语
• 以下是两种不同的植物生殖方式，请根据图回答．（1）图A属于______生殖，图B属于______生殖．（2）若图A中的植物体的基因组成是Ee，则该植物体产生的后代的基因有______种可能，分-生物
• 种子的胚由下列哪种结构发育而来的（）A．胚乳B．卵细胞C．受精卵D．受精极核-生物
• Will you tell meI can keep fit and healthy?[ ]A. Whether B. ifC. whatD. how-高一英语
• The village is ______what it looked like when they settled their homes there 20 years ago.[ ]A. not
• He is strict with himself and always thinks of ____ he can work well. [ ]A. when B. that C. what D.
• 下列诗句中的描述与生殖现象无关的是（）A．春种一粒粟，秋收万颗子B．离离原上草，一岁一枯荣C．红豆生南国，春来发几枝D．忽如一夜春风来，千树万树梨花开-生物
• Measures have been taken to solve the problem，but it may be some time________the situation improves.
• 在有性生殖过程中，______和______就是基因在亲子间传递的“桥梁”．-生物
• 下列生殖方式中属于有性生殖的是（）A．用青萝卜的根尖组织培育出萝卜幼苗B．将家兔的乳腺细胞核融合到乙兔的去核卵细胞中，由该细胞发育成新个体C．马铃薯的块茎发芽生根，进而发-生物
• 若图是被子植物番茄花的部分结构示意图，请据图回答：（1）番茄一般用种子繁殖后代，这种生殖方式属于______生殖．（2）①、②、③合称______，它属于花的主要部分．（3）受精作用完成后-生物
• 下列属于有性生殖的是（）A．草履虫的分裂生殖B．酵母菌的出芽生殖C．病毒的增殖D．小麦用种子繁殖-生物
• —Hegotthefirstplaceintheexamination.—That’s_________hisparentsaresopleasedwithhim. [ ]A.when B.becau
• Please remind me ____ he said he was coming. I may have time to meet him at the airport. [ ]A. where
• 家蚕是通过有性生殖繁殖后代的，其特点是；（）A．有精子和卵细胞融合的过程B．由卵细胞直接发育成新个体C．雌雄同体，异体受精D．雌雄同体，自体受精-生物
• 第一例“试管婴儿”的诞生，被称为“继器官移植之后的第二大医学奇迹”．此项技术是解决不孕症的有效手段．“试管婴儿”实际上是指受精卵在体外培养3～5天，形成胚胎后移植回母体子宫-生物
• -I drove to Zhuhai for the air show last week.-Is that __you had a few days, off?[ ]A. whereB. whatC
• — I'll ask the teacher about the attributive clause. I'm very puzzled about it.— That'
• Children should be instructed to put things ____ they belong in their early childhood.[ ]A. where B.
• 下列属于有性生殖的是（）A．椒草的叶片长成新植株B．马铃薯块茎发芽生根C．桃树种子的胚发育成新植株D．竹地下茎节上的芽长成新的竹子-生物
• Life is ten percent what happens to you and ninety percent _____ you respond to it. [ ]A. that B. wh
• — He is eager to try something he has never tried before. — Oh, I see. That's ____ he's di
• 下列花卉繁殖方式，属于有性生殖的是（）A．用叶繁殖秋海棠B．用茎繁殖月季C．用种子繁殖金钱橘D．用组织培养繁殖君子兰-生物
• Go and get your coat. It's ___ you left it.[ ]A. thereB. where C. what D. where there-高二英语
• 下列细胞中，不能形成生物体的是（）A．芽孢B．受精卵C．孢子D．精子-生物
• You should explore your talents so as to find out ____ your real interests lie. [ ]A. what B. which
• Having arrived at the earthquake-stricken area, we were led to ____ the homeless people lived. [ ]A.
• 植物个体发育的顺序是（）A．受精卵→胚乳→植株B．受精卵→胚→植株C．胚→胚乳→植株D．胚乳→胚→植株-生物
• 下图为某农田生态系统的食物网，请据图分析回答(1)春季，农民通过播种育秧种植水稻，水稻的生殖类型属于_________生殖。(2)该食物网中属于不完全变态发育的生物是_________。-八年级生物
• 植物个体发育的顺序是[]A．受精卵→胚乳→植株B．受精卵→胚→植株C．胚→胚乳→植株D．胚乳→胚→植株-八年级生物
• The road is covered with snow. I can't understand ______ they insist on going by motor-bike. [
• You should try to get a good night's sleep _____ much work you have to do. [ ]A. however B. no
• — I prefer shutting myself in and listening to music all day on Sundays.— That's _____ I don�
• 植物个体发育的正确顺序是（）A．种子--幼苗--植株B．胚--幼苗--植株C．受精卵--胚--植株D．胚乳--胚--植株-生物
• You are saying that everyone should be equal, and this is ________ I disagree. [ ]A. why B. whereC.
• Have you ever wondered _____ there are so many natural disasters across the world in 2010? [ ]A. whi
• We cannot figure out _____ quite a number of insects, birds, and animals are dying out. [ ]A. that B
• The old lady's hand shook frequently. She explained to her doctor ____ this shaking had begun h
• 下列属于有性生殖方式繁殖的生物是（）A．扦插的葡萄B．用种子繁殖的玉米C．用叶繁殖的椒草D．嫁接的桃-生物
• We cannot figure out __quite a number of insects, birds, and animals are dying out.[ ]A. that B. asC