为了证明镁是大豆生活必需的无机盐，取两株生长状态相同的大豆幼苗，将其中的一株培养在含镁的培养液中，另一份培养在_____中。[]A．纯净水B．不含镁的沙土C．只含镁的水D．不含-七年级生物

更多内容推荐

• –What made you so sad?--____________ my cellphone.A．LoseB．LosingC．To loseD．Lost-高二英语
• At the foot of the mountain, __________ .A．a village lieB．lies a villageC．does a village lieD．lying
• Not until he failed in the last examination _________ he should have spent more time on study.A．did
• Only when _____ be possible to sign the contract.A．the lawyer comes it willB．does the manager come w
• ----Have you got any particular plans for the coming holiday? ----Yes. , I’m going to visit some hom
• So noisy____ in the dining hall that he could only make himself heard by shouting at the top of his
• Maybe you have been to many countries, but nowhere else _______ a more beautiful palace.A．can you fi
• This problem may lead to more serious ones if _____ unsolved.A．makingB．leftC．remainedD．keeping-高二英语
• On the top of the hill_____ the old man once lived.A．a temple stands there in which B．stands a templ
• On no account ________ to our plan for the picnic.A．she will agreeB．agree she willC．will she agreeD．
• 俗话说“庄稼一枝花，全靠肥当家”。植物生长过程中需要量最多的无机盐分别是含______、_______、_______的无机盐。-七年级生物
• On the top of the mountain ______, dating from the 14th century.A．does an old temple stand B．stand a
• ________ a mobile phone can you ring ______ you want to talk with anyway.A．Using; whoeverB．Only on;
• So hard ______ that we had to wait another day.A．did it rainB．it rainedC．has it rainedD．it has raine
• This problem may lead to more serious ones if_______ unsolved.A．makingB．leftC．remainedD．keeping-高二英语
• If the weather is fine, we’ll go. If ______, ______.A．not; notB．no; noC．not; noD．no; not-高三英语
• Little ______ about his own safety, though he was in great danger himself.A．cared heB．he caredC．did
• Near the church _____ cottage. [ ]A. was such an old B. had a so old C. was such old a D. is so an o
• _____ to make a speech, he said he would be glad to.A．When askedB．When askingC．When he was askingD．W
• Out­­­­­­­­­ _____, with an apple in his hand．A．rushed the boyB．
• 如图，在甲乙两试管中分别放入等量的液体，甲试管中的液体为清水，乙试管中的液体为浓盐水。取两根大小相似的新鲜香菜，洗净，分别插入甲、乙两支试管中。在两试管的管口处用-七年级生物
• On top of the hill ______, whose style can be traced to the ages of the Roman Empire. A．there standi
• --- You can’t have enjoyed your picnic in the rain last Saturday, I’m afraid.--- On the contrary, we
• Not once ________ to Michael that he could one day become a top student in his class.A．occurred itB
• So far as I am concerned, he is a determined man and on no account ______ die easily.A．he says B．he
• Only when he apologizes for his rudeness _____ to him again.A．I will speakB．will I speakC．do I speak
• If _____ without following the doctor’s instructions, the medicine may have serious side effects. A．
• Only when _____ the painting _____ decide whether the painting is worth buying.A．he sees, he canB．do
• He failed the mid-term examination and only then________how much time he had wasted.A．he realizedB．d
• Not until he met with the difficulty _______ the importance of group work．A．he realizedB．did he real
• I live in the City of New York, on a small island of which _______.A．is the Statue of Liberty stand
• Only when _______ be possible to sign the papers.A．does the lawyer come with itB．the lawyer comes wi
• _____ can you get a better job in so competitive working places.A．Working hardB．Although you work h
• Only by doing what your soul is eager to do_______ your life something full of beautiful memories.A．
• So desperate _______ that no one could help another, each ________ to save himself and his animals.A
• How frequently _______, the works of Shakespeare always attract many people.A．performedB．performing
• It was announced that only when the terrible disease was under control ________ to return to their h
• Our shoes are of great variety and quality.________. Quickly buy it!A．Opportunity seldom knocks twic
• Only after Mary read her article a second time _____the spelling mistakes.A．did she noticeB．she noti
• Seldom ____ any mistakes during my past few years of working here. A．would I makeB．did I makeC．I did
• Not only ______, but Hunan TV’s reality show, Dad, Where Are We Going, also has made the stars and t
• Only when Jim was away from home _______ how nice his family was. A．did he realizeB．he realizedC．has
• Only with the greatest of luck _____to escape from the rising flood waters.A．managed sheB．she manage
• Only when the war was over _______ return to his hometowns．A．have the soldiersB．the soldiersC．the so
• ——Did you know any Chinese before you arrived in Beijing?——Never ________it, actually.A．had I learne
• The flowers his friend gave him will die unless _________ every day.A．wateringB．wateredC．is wateredD
• _______ I get a job will I have enough money to go to university.A．Only ifB．OnlyC．If onlyD．So long a
• _______ , his face as white as a sheet of paper.A．A boy rushing inB．In a boy rushedC．Rushed a boy in
• As your spoken English gets better, so ___ your written English.A．willB．doC．isD．has-高三英语
• I don’t know the restaurant，but it is ____ to be quite a good one.A．saidB．toldC．spokenD．talked-高二英语