问题 问答题

旱生植物

答案

参考答案:适于在干旱环境中生长,能较长时间地忍受干旱胁迫、维持水分平衡并进行正常的生长发育,它们能耐受的土壤水分张力上限大于4MPa。根据旱生植物对水分胁迫(这里指水分亏缺引起的胁迫)的响应方式,可以区分出避免干旱胁迫的植物(避旱植物)和忍耐干旱胁迫的植物(耐旱植物)两个大类。

选择题
阅读理解

阅读理解。

     Dear Daddy,

     You've been gone for six years and I've had time to think.Now I'm ready to write this letter

to you.

      For a long time after Mom died,I thought I liked her more because I didn't like your tough

guy attitude and I thought that her softer side was more desirable.In my 15yearold's mind,I

thought you could have stopped my mother from drinking herself to death.Instead,you were

off playing tennis and working.Later,I realized that no one could make someone stop drinking.

Support is important,but at the end of the day,it is a choice.You were just doing your best.

     What I have learned is that I am much like you.You taught me selfconfidence.I know if I am

prepared to work hard enough for something,I will be successful.This is no small thing.What I've

realized since you died is that you were always there for me.You fought to ensure that I got my

place on the Quebec badminton team that I had earned.When I got divorced,you came up to see

if I had what I needed to take care of the boys and you paid off my car.

     You taught me not to spend money I don't have.I've always kept to that rule.It has served me

well.We always had a good home to live in,nice vacations,and everything we needed and most of

what we wanted.

     You were not a perfect parent and neither am I.My children are much more thankful than I

ever was.I am thankful that I had you as my dad.I am still Daddy's girl and I am proud of it.

1.We can know the writer's father________ .

A.always put his family in first place

B.didn't understand his daughter

C.didn't treat his daughter well

D.died six years ago

2.The writer now doesn't think her father________.

A.was a good husband or father

B.had the right attitude toward her

C.was responsible for her mother's death

D.did his best to prevent her mother from drinking

3.Which of the following things did the writer's father teach her?

a.selfconfidence  

b.to love doing sports

c.not to hate anybody    

d.to spend money properly

A.abc  

B.bd  

C.cd  

D.ad

4.What can we infer from the letter?

A.The writer's father cared about her very much.

B.The writer didn' t have a good childhood.

C.The writer's children don't love her.

D.The writer now lives alone.

5.From the last paragraph we know the writer________.

A.thinks she is a much better parent than her dad

B.is thankful for everything she has

C.considers her father to be perfect

D.is proud to have such a father