as以--的方式;如同--那样adv.11.way 点n.12.both两个 pron. 查看更多

 

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(10分)生长素的主要作用是促进细胞纵向伸长,其作用机理如图所示,请回答下列问题:

(1)生长素作用的第一步是与细胞膜上的受体结合,形成“激素—受体复合物”,这一过程体现了细胞膜的_________功能。
(2)被激活的“激素—受体复合物”能引起内质网释放Ca2 + , Ca2 +促使细胞内的 H+        的方式运往细胞外,增加了细胞壁的延展性,使细胞壁对细胞的压力减小,导致细胞吸水、体积增大而发生不可逆增长。细胞在生长过程中体积变化最大的细胞器是________。实验发现,细胞在持续生长过程中,细胞壁的厚度能基本保持不变,出现这种现象的原因是由于_____________(填细胞器)为细胞壁添加了新的成分。
(3) Ca2 +还能激活细胞中的转录因子,它进入细胞核后,能引起____酶催化 mRNA 的合成。
(4)生长素促进根系生长的最适宜浓度要比茎低得多,稍高浓度的生长素能促进乙烯的生物合成,从而抑制了根的伸长,这说明生长素的作用具有__________。
(5)科学家研究发现紫外线可以抑制植物生长,原因是紫外线增加了植物体内吲哚乙酸氧化酶的活性,从而促进了生长素氧化为3—亚甲基氧代吲哚,而后者没有促进细胞伸长的作用。现在提供生长状况相同的健康的小麦幼苗若干作为实验材料,请完成下列实验方案,以验证紫外线抑制植物生长与生长素的氧化有关。
步骤 1 :将小麦幼苗平均分为甲组和乙组。
步骤 2 :给予甲组适宜的可见光光照,给予乙组_______________________光照。
步骤 3 :观察两组幼苗的________________,并测量___________的含量。
预测实验结果: ______________________________________________________。

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汉译英。
1. 严肃的                    ______________
2. 注释                       ______________
3. 表示……的意思      ______________
4. 以……的方式         ______________
5. 某个方面                ______________
6. 两个(都)             ______________
7. 物理                       ______________
8. 然而                       ______________

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短文填空。
     A teacher from a western country visited a school in an eastern country. In one class, she watched sixty
 children as they learned to draw a cat. The teacher drew a big O, __1__ (在黑板上) and sixty children
 copied it on their papers. The teacher drew a small O on the top of the first and then put two △△ on top
 of it. The children drew__2__ (以同样的方式). The lesson went on until there were sixty-one cats
 __3__ (在教室里). Each student's cat looked exactly like the one on the board.?
     The visiting teacher watched the lesson and __4__ (很惊讶). The teaching methods (ways) were very
 much __5__ (不同于) the way of teaching in her country. A children's art lesson in her own country
 produced a roomful of pictures, each one is quite different from the __6__ (其它的). Why? What makes
  this difference in educational methods? In a classroom in any country, the teacher teaches more than art
 or history or language.?
     In a country such as __7__ (美国) or Canada, students are asked to work by themselves and find
 answers themselves. The students are helped to learn to have __8__ (他们自己的主意). In countries
 such as China and Japan, students often work together and help __9__ (互相) in the classroom, but the
 teachers teach and the students listen. The students are asked to memorize a lot. They have to learn the
 same textbook. They __10__ (做) the same homework and give the same answers.

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暑假即将来临,某校学生会打算在假期举行为贫困地区和受灾地区的孩子们奉献爱心的活动。请你用英语写一封倡议书,号召同学们用力所能及的方式伸出援助之手,奉献自己的爱心。
要求:
1、文中应包含:至少两种帮助方式:这样做的目的和意义。
2、字数80~800;短文的开头已给出,不计入总词数。
Dear schoolmates,
While we are sitting in our bright classroom, remember there are lots of children in the poor and disaster areas needing our help badly. Summer vacation is coming. Let’s do something to help them.
As students, ___________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
_____________________________________________________
Student’s Union
June 13, 2008

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书面表达

  外籍教师Richard想了解一下你所在班级学生的到校方式。假如你是李华,请以“The way I go to school”为题,写一篇英语短文,向Richard介绍自己到校的方式。

提示:

1.How do you go to school?

2.Why do you prefer to go in that way?

要求:

1.短文须包括所有提示内容,并围绕你所选择的某种交通方式,写出二至三个理由,可适当发挥。

2.文中不得出现真实的人名、校名和地名。

3.词数:60~80。(短文开头已给出,不计入总词数)

The way I go to school

  I'm Li Hua.________________

________________

________________

________________

________________

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