在科学史上许多科学家分别用科学的思想方法取得了重大科技成就，在下列生物领域的发现

发布时间：2017-05-22 05:43 │ 来源：www.tikuol.com

题型：选择题

问题：

在科学史上许多科学家分别用科学的思想方法取得了重大科技成就，在下列生物领域的发现中，科学家与其使用的技术或方法对应完全一致的一组是[ ]

A．科学发现：基因在染色体上科学家：萨顿科学家的思想或方法：假说―演绎法

B．科学发现：遗传的基本规律科学家：孟德尔科学家的思想或方法：假说―演绎法

C．科学发现：光合作用中O₂的来源科学家：卡尔文科学家的思想或方法：同位素标记H₂¹⁸O

D．科学发现：DNA是遗传物质科学家：艾弗里科学家的思想或方法：³⁵S标记噬菌体的蛋白质外壳

考点：科学研究方法

题型：选择题

关于匀变速直线运动的说法，不正确的是（　　）

A．某段时间内的平均速度等于这段时间内的初速度和末速度和的一半

B．在任意相等的时间内位移的变化相等

C．在任意相等的时间内速度的变化相等

D．某段时间内的平均速度，等于中间时刻的瞬时速度

查看答案

题型：选择题

索引属于

A．模式

B．内模式

C．外模式

D．概念模式

查看答案

题型：选择题

完形填空。

     Last weekends, my kids along with a few other kids from the neighborhood volunteered to help me wash
my car. My 10-year-old daughter came up with the idea of   1 other people's cars as well. It was pretty   2
outside and I had no plans to   3 be ing in the bright sun. She   4 wanted to give lemonade (柠檬汽水) to
passers-by for free. I had seen little kids   5 and sell fresh lemonade for a small cost but not free. Although I
felt   6  , I decided to help her.
       7 she asked me,"What if we   8 this a smile car wash?"I couldn't hold back my tears and   9 her and
the other kids to go outside the house and come up with   10 ideas. While I kept myself busy in drying the car,
the gang walked up to me with a(n)   11 with beautiful images of smiles. They had " Free Car Wash" written
on it and the   12 of their exercise was"smile".It was pretty neat to see a team of kids ranging 5-11 years with
the   13 to do something for others.
     All that seemed   14   and came right from their heart. Noth ing seemed to   15 to them: their playtime, the
heat outside-they just wanted to 16   others and do something nice in the community!
     I helped them make some fresh lemonade and brought out some additional   17 to help clean cars.
Passers-by were   18 and one even shouted back to them saying"God bless you, my kids..."One of them even
tried giving them a 5 dollars, which they refused. A pretty heartwarming   19 !
     I feel blessed by being   20 by such wonderful and loving souls.

( )1. A. drying
( )2. A. quiet
( )3. A. suggest
( )4. A. further
( )5. A. choose
( )6. A. worried
( )7. A. Finally
( )8. A. show
( )9. A. challenged
( )10. A. creative
( )11. A. board
( )12. A. purpose
( )13. A. need
( )14. A. important
( )15. A. matter
( )16. A. relax
( )17. A. friends
( )18. A. interested
( )19. A. scene
( )20. A. supported

B. repairing
B. hot
B. avoid
B. therefore
B. enjoy
B. popular
B. Simply
B. leave
B. expected
B. ready
B. picture
B. trouble
B. duty
B. disappointing
B. object
B. try
B. rags
B. amazed
B. gift
B. understood

C. washing
C. different
C. continue
C. already
C. buy
C. confused
C. Then
C. make
C. invited
C. changed
C. idea
C. secret
C. imagination
C. hopeful
C. belong
C. help
C. children
C. bored
C. story
C. refused

D. decorating
D. dirty
D. practise
D. hardly
D. serve
D. difficult
D. Luckily
D. order
D. encouraged
D. familiar
D. car
D. theme
D. skill
D. natural
D. refer
D. smile
D. fruit
D. frightened
D. explanation
D. surrounded

查看答案

题型：选择题

如果一国的国际收支出现逆差，容易导致本国国民收入（）。

A.增加

B.减少

C.不变

查看答案

题型：选择题

简述自然旅游资源的含义。

查看答案

更多题库