下列关于转基因植物的叙述,不正确的是() A.转入到油菜的抗除草剂基因,可能通过花粉

题型:多项选择题

问题:

下列关于转基因植物的叙述,不正确的是()

A.转入到油菜的抗除草剂基因,可能通过花粉传入环境中

B.转抗虫基因的植物,不会导致昆虫群体抗性基因频率增加

C.动物的生长激素基因转入植物后不能表达

D.如转基因植物的外源基因来源于自然界,则不存在安全性问题

考点:高中生物基因工程、生物技术的安全性和伦理问题基因工程、生物技术的安全性和伦理问题题库
题型:多项选择题

某兴趣小组的同学们在做“用打点计时器测速度”的实验中,打出的一条纸带如图所示,图中直尺的单位为cm,点O为纸带上记录到的第一点,点A、B、C、D…依次表示点O以后连续的各点,各点到O点的距离分别为X1、X2、X3、X4、X5、X6、X7、X8,已知所用电源的周期T为0.02s.

(1)O点到F点的距离X6=______cm.

(2)打点计时器打下点G时物体的速度可用表达式vG=______进行计算更准确(用题中给的符号表示).

vG=______ (保留三位有效数字)

题型:多项选择题
I did very badly at school. My headmaster thought I was       and when I was 14 he said, “You’re never going to be         but a failure.”
After five years of         jobs, I fell in love with a very nice middle-class girl. It was the best        that could have happened to me. I        I wanted to do something positive (积极地) with my life because I wanted to prove to       that what people said about me was       . Especially her mother, who had said to me, “Let’s         it, you’ve failed at everything you’ve ever done.” So I tried hard with my        and went to college. My first novel        while I was at college.
After college I taught during the         in high schools and attended evening classes at London University, where I got a         in history. I became a lecturer at a college and was thinking of        that job to write full time         I was offered a part-time job at Leeds University. I began to feel         of myself — here was a working-class boy who’d         school early, now teaching at the university.
My writing career (职业) took off when I discovered my own style. Now I’m rich and       , have been on TV, and met lots of film stars.         what does it mean? I         wish all the people that have put me down had       : “I believe in you. You’ll succeed.”
小题1:
A.brightB.simple C.uselessD.hopeful
小题2:
A.anythingB.somethingC.everything D.nothing
小题3:
A.low B.poorC.good D.useful
小题4:
A.support B.happinessC.surprise D.thing
小题5:
A.agreedB.decidedC.planned D.told
小题6:
A.me B.themC.herD.it
小题7:
A.wrongB.right C.stupidD.faulty
小题8:
A.seeB.knowC.faceD.understand
小题9:
A.experimentB.practiceC.writingD.composition
小题10:
A.came onB.came inC.came outD.came back
小题11:
A.dayB.nightC.monthD.year
小题12:
A.graduationB.passC.degreeD.success
小题13:
A.giving inB.giving backC.giving outD.giving up
小题14:
A.whileB.if C.whenD.or
小题15:
A.shyB.proud C.happyD.surprised
小题16:
A.leftB.attendedC.changedD.graduated
小题17:
A.tiredB.calmC.nervousD.famous
小题18:
A.AndB.ButC.HoweverD.Well
小题19:
A.justB.exactlyC.soD.very
小题20:
A.praisedB.saidC.answeredD.advised
题型:多项选择题

以下是小明同学对溶液有关知识的认识,其中正确的是[ ]

A、浑浊的河水经过滤即可得到蒸馏水

B、蔗糖、面粉、酒精均能溶于水形成溶液

C、用洗涤剂或汽油去除油污的原理相同

D、加压、降温均能使汽水中溶有更多的CO2

题型:多项选择题

女,14岁,前牙牙列不齐、拥挤、前牙唇侧牙间 * * 肥大,牙龈充血水肿,无疼痛,此患者最可能的诊断是()

A.妊娠期龈炎

B.牙龈纤维瘤病

C.药物性增生

D.青春期龈炎

E.白血病

题型:多项选择题

两个星的星等差比是5倍,则亮度比是()

A、5.0

B、25.0

C、75.0

D、100.0

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