油菜“花而不实”是由于缺乏哪种无机盐[]A．缺氮B．缺磷C．缺钙D．缺硼-七年级生物

更多内容推荐

• “庄稼一枝花，全靠肥当家”。下列对这句农谚的理解中不正确的是[]A．只要有了“肥”，庄稼就能生长发育好B．“肥”是指植物所必需的含氮、磷、钾等元素的无机盐C．这句农谚强调了“肥-七年级生物
• 农业生产上只有根据种植植物的目的来确定各种无机盐的施用量才能获得高产。[]-七年级生物
• X、Y、Z是三个相邻的植物细胞，已知Z细胞液浓度＞Y细胞液浓度＞X细胞液浓度。下列各图中能正确表示三者吸失水关系的是（注：箭头表示水的流向）[]A．B．C．D．-七年级生物
• _______ about the economic crisis that he decided to look for more information about it.A．So curious
• Not everto “Shanzhamei”, a country girl, that she could be the first runner-up of 2013 on the Avenue
• In the dark forests ________，some large enough to hold several English towns.A．stand many lakesB．lie
• ---Do you have any idea what Hawk does all day?--- I know he spends at least as much time watching T
• __________ we had read your letter __________ the true state of affairs.A．It was until; that we unde
• Not until he retired from teaching three years ago ________having a holiday abroad.(2012·辽宁，32)A．he
• —Tom, how forgetful you are! I found you left your key in the keyhole this morning. —Oh, dear! _____
• (2013·皖南八校第一次联考)He is only too ready to help others, seldom, ________， refusing them when they turn
• (2013·乌鲁木齐高三第一次诊断性测验)The Chinese government promised that under no circumstances ________ the effort
• Not until I completed the formthat half questions were not relevant to me.A．had I realizedB．I had re
• __________ the style of the singer, but they also followed him everywhere.A．Not only the fans copie
• (2013·江苏，27)“Never for a second，”the boy says，“________that my father would come to my rescue.”A．I d
• _______, they had no chance of winning the war.A．As they fought bravelyB．Bravely though they fought
• The young man felt so guilty about his drunk driving that not a single word ____ to defend himself i
• The experiment shows that proper amounts of exercise, if _______ regularly, can improve our health.
• Only by practising a few hours every day ________ be able to play the piano well.A．you wouldB．would
• Only in this way ______ progress in your English .A．you makeB．can you makeC．you be able to makeD．wi
• If Joe’s wife won’t go to the party，________.A．he will eitherB．neither will heC．he neither willD．eit
• Not until I came home last night ______ to bed .A．Mum did goB．did Mum goC．went MumD．Mum went-高一英语
• There ___when we came here last time, which was said to date back to 773 BC. A. stood a great castle
• While_________in Britain, he made friends with the natives there.A．working B．worked C．he worksD．he i
• Though _____ money, his parents managed to send him to university.A．lackingB．lackC．lacked inD．lackin
• The interviewee has no inner shame to show his edge over others. _______ the outer fear.A．As he hasB
• While ______ himself in the newspaper in a cafe , he got his pocket picked.A．having buriedB．buriedC．
• Among the crises that face humans ________ the lack of natural resources.A．isB．areC．is thereD．are th
• By the side of the Bird’s Nest , completed in 2008.A．there standing the Water CubeB．stands the Water
• He is very good at carpentering, though ______.A．is very youngB．very youngC．hevery youngD．he was ve
• He dressed up and went to the party as if ________.A．was invitedB．had been invitedC．to be invitedD．i
• Not a single word ________ about the way he was treated, but his unhappiness was revealed through hi
• The old couple have been married for 40 years and never once ______ with eachOther.A．they had quarre
• Your car should be ready by 12 o’clock, but ___, I’ll let you know.A．if possibleB．if everC．if anythi
• －You seem to know little about Yancheng Middle School. Aren’t you a teacher here?－No, but I ________
• China Business Daily reported the 60% discounts on some Beijing-shanghai flights have now slipped ba
• It was announced that only when the fire was under control _______ permitted to return to their home
• He failed in the exams and only then _____ how much time he had wasted. A．he realizedB．did he realiz
• ---It ______ be only two days before I have the job interview.---______ you succeed.A．must; MayB．mus
• Not unti his fellows criticized him _______ to admit his mistake.A．does he beginB．did he beginC．bega
• We arrived at a farmhouse, in front of ______.A．it sat a smallB．which a small boy sat there C．which
• So much progress _____ in the past few months that she now has no difficulty in making herself under
• －How was your final exam, Tom?－I’m sorry, dad. I failed and only thenthe importance of studies.A．I r
• We should keep it in mind that beneath our feet ______ that our life depends on for food and clothin
• If you don’t sign up for the game, ________.A．so will IB．neither do IC．neither will ID．nor do I-高三英语
• No sooner _____ the news than they rushed out into the street.A．they heardB．they had heard C．did th
• Only after her mother came to help her for the first few months ______ to begin her project.A．did sh
• So lost in their computers____that leaders at summer computer camps often have to force them to brea
• As we all know, every minute _____ full use of ____ our lessons will do good to us students.A．which
• ______, but he couldn’t understand the logical connection of the two subjects.A．Having told many ti