2021 年 5 月 22 日,全国劳模、共和国勋章获得者袁隆平院士逝世,让世人哀叹,其劳模精神和高产杂交水稻永为人类福祉。水稻有高茎与矮茎之分,该性状由一对基因( A/a )控制,选取高茎水稻和矮茎水稻进行杂交实验,结果如表所示,请回答:
组别 | 亲代组合 | 子代性状 |
甲 | 高茎 × 矮茎 | 全是高茎 |
乙 | 高茎 × 矮茎 | 既有高茎,又有矮茎 |
丙 | 高茎 × 高茎 | 既有高茎,又有矮茎 |
( 1 )水稻的高茎和矮茎在遗传学中称为 ____ 。
( 2 )根据甲、丙组实验均可推断, ____ 是显性性状。
( 3 )根据乙组实验推断,其亲代最可能的基因型分别是 ____ 和 ____ 。
( 4 )丙组实验子代既有高茎,又有矮茎,其中高茎的比例是 ____ 。
( 5 )缺肥时基因型为 AA 的水稻也较矮,由此说明: ____ 。
When you have a cold, your friends can’t visit you because they don’t want to get a cold. When you are part of a family, if one of you gets a cold, often all of you get it.
1 . . Below are four ways to help stop a cold spreading and to feel better again.
●Wash your hands.
Washing your hands is the most important way to stop the spread of colds. Cold germs ( 病菌 ) are spread by touch. The germs get onto your hands and from there into your eyes, nose and mouth. Wash your hands carefully using soap and hot water. 2 . , they will be much less likely to get the cold.
●Cover your nose and mouth.
There is a saying that “coughs and sneezes spread illness”. 3 . when coughing and your nose if sneezing. That way, the cold germs won’t get onto your hands and spread to things you touch such as doorknobs, tap handles or cups and plates.
● 4 . .
Cold germs are spread very easily. You can use a disinfectant ( 消毒的 ) cleaner to clean doorknobs, taps, toilet handles. Be sure to use only your own towel, toothbrush and cup.
●Take care of yourself.
5 . . Eat healthy simple foods such as soup or rice. Get enough rest and sleep. Stay in bed, read a book. Do your schoolwork and practice your English!
Remember that a common cold only lasts a few days. You will feel better soon.
A . Some cold medicines can help stop aches and fever
B . Cold germs can be spread by coughing and sneezing
C . If all the members of your family wash their hands too
D . Always use a piece of soft paper to cover your mouth
E.When you wash your hands every half an hour
F.Clean your house
G.There is no good method of treating the common cold
电冰箱是常用的家用电器,小明同学想了解家里冰箱的温度,他用温度计先测量家里的室温,温度计示数如图甲所示,再用温度计测量冰箱冷冻室的温度,温度计示数如图乙所示,家里的室温比冰箱冷冻室温度高______℃。他又用弹簧测力计测量一个小木块的重力,小木块静止,如图丙,小木块的重力为______N。
初中三年的学校生活即将成为美好的回忆。回首三年时光 , 你有哪些收获 ? 即将毕业 , 你有什么感受 ?
假如你是李华 , 你校英文校刊邀请你写一篇短文谈谈毕业之际的感想 , 内容包括你三年学校生活的收获以及你即将毕业的感受。
提示词语 :knowledge, friend, memory, happy
提示问题 :●What have you got during the past three years?
● How do you feel upon graduation?
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(2019·江苏中考模拟)如图,AB∥CD,则根据图中标注的角,下列关系中成立的是 ( )
A.∠1=∠3 B.∠2+∠3=180° C.∠2+∠4<180° D.∠3+∠5=180°
- Sorry,___________. What do you mean by saying "look out"?
- I asked you "to be careful", not "to look outside"
A. I can't hear you B. I can't see clearly
C. I don't notice you D. I don't follow you
(2019·海南中考模拟)小明同学把一个含有45°角的直角三角板在如图所示的两条平行线上,测得
,则
的度数是( )
A.45° B.55° C.65° D.75°
截至2016年12月,我国青少年网民也就是19岁以下的网民,已经达到1.7亿,手机已成为青少年上网方式的首选。但青少年在利用手机网络拓展视野、与人交往的同时,也面临着信息纷繁复杂、网友真假难辨的困扰。青少年在使用手机网络时,应做到( )
A.增强猎奇心理,广泛结交网友
B.提供个人虚假信息,谨防上当受骗
C.抵制不良诱惑,拒绝网络交友
D.吸取有益信息,提高明辨是非的能力
—Happy birthday, Mr. Wang! Here are some presents from ________ of us.
—Thank you so much, boys and girls!
A.both B.neither C.either D.all
学知明理 感悟生活
材料一:
(注:“十二五”期间,株洲市地区生产总值从2011年的1 564.3亿元增长到2015年的2 335.1亿元。目前,株洲市全面小康总体实现程度达93.3%,连续两年位居全省第二)
材料二:2015年5月25日,历时两年编制的《株洲市国民经济和社会发展第十三个五年规划纲要》(以下简称《纲要》)正式发布。《纲要》明确提出,在2017年,株洲要在全省率先全面建成小康社会。
(1)根据材料一,说一说,株洲要在全省率先全面建成小康社会的信心来自哪里?(4分)
(2)结合所学知识,谈一谈,株洲要在全省率先全面建成小康社会的原因是什么?(8分)
下列有关物质的鉴别方法正确的是( )
选项 | 被鉴别物质 | 鉴别方法 |
A | CO 与 CO2 | 观察颜色 |
B | 食盐与小苏打 | 闻气味 |
C | BaCl2 溶液与 Ba(OH)2 溶液 | 取样,滴加稀硫酸,观察 |
D | 纯羊毛与合成纤维 | 灼烧,闻气味 |
时势造英雄,英雄亦适时。请列举下列历史人物。
( 1)他领导美国赢得了独立,他被认为是“战争中的第一人,和平中的第一人,同胞心中的第一人”。他是: ——
( 2)他几乎横扫欧洲大陆,最后兵败滑铁卢,他主持制定的法典,是资产阶级国家最早的一部民法典,成为欧美各国资产阶级的立法典范。他是: ——
( 3)一成后,他领导印度人民抓起了非暴力不合作运动,打击了英国的殖民统治。他是: ——