问题 单项选择题

下列有关植物激素调节的叙述,不正确的是()

A.使用一定浓度的生长素处理扦插枝条,能提高插条的成活率

B.使用一定浓度的赤霉素处理芹菜幼苗,能提高芹菜的产量

C.使用一定浓度的脱落酸处理浸泡过的小麦种子,能提高种子的萌发率

D.使用一定浓度的乙烯利处理凤梨,能让凤梨提前上市

答案

参考答案:C

解析:生长素的生理作用具有两重性,在农业生产上,生长素类似物可以防止果实和叶片的脱落、促进结实、获得无子果实、促使扦插枝条的生根,A正确。赤霉素能促进细胞伸长,从而引起植株增高,促进种子萌发和果实发育,B正确。脱落酸是抑制细胞分裂,促进叶和果实的衰老和脱落,C错误。乙烯主要作用是促进果实成熟,生产中用的是乙烯利,D正确。考点:本题考查植物激素的相关知识,意在考查考生理解所学知识的要点,把握知识间的内在联系的能力。

选择题
阅读理解

It was a comfortable sunny Sunday. I was going to meet an old university friend I hadn't seen for years, and was really excited to hear all his news.

My train was running a little late, but that was no big problem - I could text him to say I would be delayed. He would understand. But… where was my mobile phone? I had that familiar sinking feeling. Yes, I'd forgotten it at home.

No mobile phone. I'm sure I'm not alone in feeling anxious, on edge and worried when I don't have my phone with me. In fact, I know I'm not alone: two-thirds of us experience ‘nomophobia’, the fear of being out of mobile phone contact.

That's according to a study from 2012 which surveyed 1,000 people in the UK about their relationship with mobile phones.

It says we check our mobile phones 34 times a day, that women are more ‘nomophobic’than men, and that 18-24 year-olds are the most likely to suffer fear of being without their mobiles: 77% of them say they are unable to be apart from their phones for more than a few minutes.

Do you have nomophobia ?

· You never turn your phone off

· You obsessively check for texts, missed calls and emails· You always take your phone to the bathroom with you· You never let the battery run out

It's funny to think that around 20 years ago the only people with mobile phones would be businessperson carrying their large, plastic ‘bricks’.   Of course, these days, mobile phones are everywhere. A UN study from this year said mobile phone subscriptions would outnumber people across the world by the end of 2014.

And when there are more phones than people in the world, maybe it's time to ask who really is in charge? Are you in control of your phone, or does your phone control you?

So, what happened with my university friend? When I arrived a few minutes late he just laughed and said: "You haven't changed at all – still always late!" And we had a great afternoon catching up, full of jokes and stories, with no interruptions and no nagging(唠叨的) desire to check my phone.

Not having it with me felt strangely liberating. Maybe I'll leave it at home on purpose next time.

小题1:What does the passage talk about ?

A.The history of mobiles.

B.The story of meeting an old university friend.

C.The addiction of playing mobile phone.

D.The terrible feeling of being without their mobiles.小题2:The underlined phrase “ on edge ”in the third paragraph probably means_______.

A. nervous

B.energetic

C.crazy

D.surprised小题3:Which word is used to describe old mobile phones according to the passage?

A.digital phone

B.cell phone

C.bricks

D.smart phone小题4:According to the passage, who is most likely to be addicted to mobiles ?

A.a successful manager

B.a 21-year-old girl

C.a 21-year-old boy

D.a lonely middle-aged person小题5:What’s the author’s attitude towards the using mobiles ?

A.Worried

B.Favorable

C.Neutral

D.Critical