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(1)据图1,若某植物幼苗已表现出向光性,且测得其向光面的生长素浓度为m,则背光面生长素浓度范围是 。
(2)据图1可知,
(3)在探究生长素促进插条生根的最适浓度时,一名技术人员用几种不同浓度生长素溶液处理插条基部,然后在沙床中培养,观察生根情况。图2为生长素促进枝条生根的情况。请结合图1判断,在下列各项浓度值中,最好选用( )
| A.3mg·mL-1 | B.6 mg·mL-1 | C.9 mg·mL-1 | D.4.5 mg·mL-1 |
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实验发现,细胞在持续生长过程中,细胞壁将发生一定变化,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此外,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。 查看习题详情和答案>>
| 短文写作。 | ||||
| 假设你就“对独生子女政策的看法”在社区展开调查,请根据表格所提供的信息在英语课上介绍调查 的结果。
2. 词数80左右,开头已给不记入总词数。 Here is a result of the survey about how people like the one-child policy. |
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If you had only three years left to live, how would you spend your time? It’s a hard question and few of us would even like to think about it. But 18-year-old Huang Ge has to answer this question and he says, “I want to thank the people who have helped me.”
At the age of one, Huang’s mother left the family. Six years later, he was badly ill. He has been using a wheelchair since 9 years old. Doctors said he would only live to 18.After Huang’s story went on TV, hundreds of people sent money to help him. The boy was so moved that he decided to thank every one of them. But he has to be tied to his wheelchair. And the family can only afford a three-wheeled motorcycle(三轮摩托). Since 2003, the father and son have traveled 14,000 kilometers, to 10 provinces, and thanked more than 30 helpers.
“I am moved by the story of the boy. We need the courage to face death, and we should also show our gratefulness to those who help us,” says an online post on CCTV. com.
1._________, Huang Ge started to use a wheelchair.
A.When he was 9 years old B.When he was 18 years old
C.When he was 10 years old D.When he was 6 years old
2.Huang and his father took a _________to thank the helpers.
A.train B.ship C.motorcycle D.bus
3.The underlined word “gratefulness” means _______________
A.诚信 B.奉献 C.宽容 D.感谢
4.Which of the following is NOT true according to the passage?
A.Hundreds of people sent money to help him.
B.Huang Ge’s mother left the family.
C.Huang Ge and his father have thanked more than 30 helpers.
D.Huang Ge was badly ill at the age of one.
5.Which is the best title for the passage?
A.A Great Success B.An Interesting Trip
C.A Grateful Heart D.A TV Show
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