热闹的,有生气的 查看更多

 

题目列表(包括答案和解析)

(9分)许多实验研究生长素(IAA)对植物生长的影响模式,如用玉米胚芽鞘作为实验材料:
实验1:将切除的胚芽鞘尖端放置于琼脂块上(图1),移去尖端后,将琼脂切成体积相等的若干个方块,将方块放在除去尖端的胚芽鞘上,实验进行一定时间后,每个胚芽鞘弯曲的角度以图2的方法测量,并计算平均值。每次放在等面积、等体积琼脂块上的胚芽鞘尖端数量不同,这样重复上述过程。

 实验2:用含有不同浓度IAA的琼脂块代替胚芽鞘尖端进一步实验。上述两个实验的结果如图3和图4所示。

(1)绘图表示,如何将琼脂块放置于胚芽鞘上,才能得到图3的结果?
(2)解释实验2的结果:IAA从0μmol/L~1.3μmol/L过程中    ;1.3μmol/L~1.8μmol/L过程中         
(3)①比较实验1和实验2的结果有什么不同?             
   ②为什么会出现这种不同?                     。
(4)从本实验可知促进胚芽鞘生长的最适生长素浓度约为_______                    
图4中曲线上b点对应生长素浓度时胚芽鞘弯曲角度为17度,把琼脂块去掉后,胚芽鞘最终会如何生长?________                                                       

查看答案和解析>>

汉译英。
1. 口号          _______
2. 神秘的      _______
3. 有光泽的   _______
4. 皮肤      _______
5. 产品         _______
6. 远景    _______
7. 美貌    _______
8. 牙膏    _______                                                                   
9. 幻觉    _______
10. 广告  _______

查看答案和解析>>

根据中英文提示,完成句子。
1. 你每周花在锻炼上的时间有多少?  
   __________________________________________________ every week?   
2. 我们大家都有必要读读哲学领域的书籍。   
   __________________________________________________ books on philosophy.   
3. 沙尘暴的发生频率没有原来高了。   
   The sandstorms _____________________________________ in the past.   
4. 人们要花很长时间才能意识到自己的错误有多严重。   
   ___________________________________________________ their mistakes are.  
5. 他不仅适应了新学校,而且和同学们相处得很好。  
   He_________________________________________________ his classmates.

查看答案和解析>>

根据提示和要求,写一篇短文。将短文写在答题卡情景作文空白处。
中学生学习时间长、大力大,专家建议学生每天课后应采取适当的方式放松自己。为此,不同的同学有不同的放松方式,有的爱看电视,有的听音乐,有的做运动…请你谈谈你通过哪些方式放松自己并说说原因,谈谈你的感受。
 提示词语:relax, TV, music, think

查看答案和解析>>

阅读理解

  When Kyle walked into Ernie’s Pet World, he looked very anxious.The shop owner, Ernie, jumped out of his seat to greet Kyle.He was the shop’s first customer of the day.

  “Good morning, sir!”Ernie said,“What can I help you with?”

  “Well, I……”Kyle started to say.

  “Wait, don’t tell me,”Ernie stopped him.“You’re looking for a …a little dog… for your daughter’s birthday, Right?”

  “Not really, I just….”

  Ernie didn’t let him finish.“Ah, I’ve got it, You just moved to a new office, and you want some fish for it, I have some very nice fish bowls over here.”

  “In fact, I…”Kyle was starting to look very nervous and strange.

  “No fish?Ah, a cat!You look like a cat person.At Ernie’s Pet World, we have the best cats.Take a look at this lovely one with long, white hair, She’s looking at you.She’s thinking,‘Take me home.Take me home.’Would you like some cat food and toys, too?”

  “No, thank you,”Kyle said.By this time, he was walking up and down.He had a terrible look on his face.“Really, I’m not interested in cats or fish or little dogs.”

  “What do you want, then?”Ernie asked.

  Kyle looked like he was going to cry.“I just want to know if can use your toilet!”he said at last.

(1)

Which is TRUE about Ernie’s Pet World?

[  ]

A.

It has many workers.

B.

Kyle goes there often.

C.

It sells school things.

D.

Ernie is the owner of the shop.

(2)

What kind of person is Ernie?

[  ]

A.

Very lazy.

B.

Rather shy.

C.

Over warm-hearted.

D.

Not friendly.

(3)

Kyle went into the Ernie’s Pet World to ________.

[  ]

A.

buy a little dog

B.

take fish home

C.

meet the shop owner

D.

look for a washroom

(4)

What does the underlined word“anxious”mean in Chinese?

[  ]

A.

焦急的

B.

兴奋的

C.

生气的

D.

失望的

(5)

What is the best title of the story?

[  ]

A.

Kyle and Ernie

B.

Pet or Toilet

C.

A Pet Lover

D.

A Busy Pet Shop

查看答案和解析>>


同步练习册答案