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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，
除草剂灭草的原理是使杂草的生长素浓度大于 （填图1中字母）。（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>>
仿写：
根据题目要求，完成(A)、(B)两项书写任务。
(A)假如你是Judy，请你根据你的成绩单，给你妈妈写一封信，汇报你的成绩。
Dear Mom,
How's it going? Things are fine here. I got my report card today. Luckily, I did OK this time. My English teacher said I was 1 . My math teacher said I was 2 and my PE teacher said I was 3 in class. However, my history teacher said I 4 . Another disappointing result was in science. My science teacher said I was a 5 student.
Well, that's all about the news I have for now. I will have to try harder at science.
Love,
Judy
(B)仿照上文，请你从不同的几个方面，向同学们介绍一下Peter的学习情况。
This is Peter's report card. He did OK in some subjects. His PE teacher said he was good at 6 . His math teacher said he was a 7 student and his English teacher said he could speak English 8 . However, his history teacher said he could get better 9 . Another disappointing result was in music. His music teacher said he 10 .
查看习题详情和答案>>以“Animals, our friends!”为题写一篇短文。
要求：1）70词左右，开头已给出，不计入总词数。
2）展开自己的想象，可以通过“dogs, cows, hens 等几种动物来进行说明。
3）适当运用get on well with….; get …from…; guide dogs; the blind; milk; hens; eggs; interesting; for example; save 等词汇。
4）意思连贯，语句通顺，书写工整。
Animals, our friends!
It is important to ________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
查看习题详情和答案>>
以“Animals, our friends!”为题写一篇短文。
要求：1）70词左右，开头已给出，不计入总词数。
2）展开自己的想象，可以通过“dogs, cows, hens 等几种动物来进行说明。
3）适当运用get on well with….; get …from…; guide dogs; the blind; milk; hens; eggs; interesting; for example; save 等词汇。
4）意思连贯，语句通顺，书写工整。
Animals, our friends!
It is important to ________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________