高中题库

[单选题]已知小麦抗病对感病为显性，无芒对有芒为显性，两对性状独立遗传。用纯合的抗病无芒与感病有芒杂交，F1自交，播种所有的F2,假定所有的F2植珠都能成活，在F2植株开花前，拔掉所有的有芒植株，并对剩余植株套袋。假定剩余的每株F2收获的种子数量相等，且F3的表现型符合遗传定律。从理论上讲F3中表现感病植株的比例为A．1/8 B.3/8 C.1/16 D.3/16

[单选题]下列关于通过发酵工程生产谷氨酸的叙述，错误的是A．发酵时需要不断通入无菌空气，否则会积累乳酸B．发酵时常采用的培养基为液体天然培养基C．从自然界分离的野生型菌株可直接用于生产D．当菌体生长进入稳定期时，补充营养物可提高谷氨酸产量

[单选题]下列关于体细胞杂交或植物细胞质遗传的叙述，错误的是A．利用植物体细胞杂交技术可克服生殖隔离的限制，培育远缘杂种B．不同种植物原生质体融合的过程属于植物体细胞杂交过程C．两个不同品种的紫茉莉杂交，正交、反交所得F1的表现型一致D．两个不同品种的紫茉莉杂交，F1的遗传物质来自母本的多于来自父本的

[试题]假设你正在参加全省中学生英语演讲比赛，请你针对有些父母经常翻看孩子日记或书包这一现象，写一篇演讲稿，陈述你的观点。演讲稿的主要内容应包括：认为同学们不必为此苦恼；希望能够体谅父母的苦衷；建议与父母进行交流和沟通。注意：1．词数100左右；2．可以适当增加细节，以使行文连贯；3．开头和结尾已为你写好，不计入总词数。G．ood morning, ladies and gentleman.Some of us are having problems with our parents, as they o

[单选题]It can be inferred from the text that.A．we can get enough resources without rainforestsB．there is great medicine potential in rainforestsC．we will grow fewer kinds of crops in the gained landD．the level of annual rainfall affects wind patterns

[单选题]What might be the best title for the text?A．How to Save RainforestsB．How to Protect NatureC．Rainforests and the EnvironmentD．Rainforests and Medical Development

[单选题]What does the word “this” underlined in the third paragraph refer to?A．We will lose much more than we can gain．B．Humans have begun destroying rainforests．C．People have a strong desire for resources．D．Much carbon dioxide comes from burning rainforests

[单选题]The chart shows that from 2005 to 2008，．A．the percentage of the Spanish families with a computer rose 35 pointsB．the percentage of the White families with a computer remained unchangedC．the number of the Black families with a computer was on the decr

[单选题]If you would like to have some vegetable beef, what may be your choice?A．French Slam? B．Chicken-Fried Steak?C．The Super Bird? D．Sandwich with Salad or Soup?

[单选题]E．A． rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely dipping below l6℃．Rainforests have a great effect on the world environment because they can take in heat

[单选题]F．rom the last paragraph we can learn that __A． some pipes have to be re-arranged in winterB． the system can do more than warming up the buildingC． the exchangers will pick up heat from the street surfaceD． less heat may be collected in winter than i

[单选题]F．or what purpose are the diving pipes used?A． To absorb heat from the sun.B． To store heat for future use.C． To turn solar energy into heat energy.D． To carry heat down below the surface.

[单选题]If one wants to attend a business lunch in London at l2：00, the latest train that he should take at Oxford leaves at．A．11：45B．11：15C．10：35 D．10：05

[单选题]C．Sometimes, the simplest ideas are the best. For example, to absorb heat from the sun to heat water, you need large, flat, black surfaces. One way to do that is to build those surfaces specially, on the roofs of buildings. But why go to all that tro

[单选题]Which of the following helps to develop traditional customs?A． The special role of oxen in farming.B． People's respect and love for oxen.C． The practical value of an ox's body.D． The contribution of oxen to the economy.

[单选题]6l. From the third paragraph, we know that __A． oxen are no more important today than in the pastB． ceremonies are held when people cook cattle bone soupC． oxen are treated as human in some areas of ChinaD． people run with oxen to shake off diseases

[单选题]Why does the author write the text?A． To stress the importance of oxen in farming.B． To introduce the Chinese folk culture.C． To describe how to celebrate the Year of Ox.D． To explain how to develop agriculture with oxen.

[单选题]If you can't remember someone's name, you may __A． tell him the truth B. tell him a white lieC． ask him for pity D. ask others to help you

[单选题]When you meet a group of people, it is better to remember __A． all their names B. a couple of names firstC． just their last names D. as many names as possible

[单选题]What does the text mainly tell us?A． Tips on an important social skill. B. Importance of attending parties.C． How to make use of associations. D. How to recite and repeat names.

[单选题]B．The year 2009 is the Year of Ox. The ox is a representative of the farming culture of China. In the farming economy (经济), oxen are the major animals pulling plows (犁).Of course, the good of oxen is not limited to plowing. In fact, they are seen as

[单选题]阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项，A．Remembering names is an important social skill．Here are some ways to master it．Recite and repeat in conversation．When you hear a person’s name，repeat it．Immediately say it to yourself several times without moving

[单选题]阅读下面短文，从短文后各题所给的四个选项（A、B、C、和D）中，选出可以填入空白处的最佳选项，A．fter spending a weekend away with my adult son, I was so impressed by his generous heart that I sent him this letter.D．ear son,I want to thank you for teaching me a very 36 lesson in life by the great

[单选题]a certain doubt among the people as to the practical value of the project．A．IthasB．TheyhaveC．ItremainsD．Thereremains

[单选题]B．ut for their help，we the program in time．A．cannotfinishB．willnotfinishC．hadnotfinishedD．couldnothavefinished

[单选题]We tried to find a table for seven，but they were all ．A．givenawayB．keptawayC．takenupD．usedup

[单选题]I'm amazed to hear from my school teacher again． ，it is ten years since we met last．A．InawordB．What’smoreC．That’stosayD．Believeitornot

[单选题]Some people who don’t like to talk much are not necessarily shy；they _____ just be quiet people．A．mustB．mayC．shouldD．would

[单选题]C．hina has got a good for fighting against the flu with its careful and smoothA．reputationB．influenceC．impressionD．knowledge

[单选题]Many children， parents are away working in big cities，are taken good care of in the village．A．theirB．whoseC．ofthemD．withwhom