问题 选择题

有关蒸腾作用的下列叙述中,错误的是(  )

A.叶是植物的主要蒸腾器官

B.较强的日照促进蒸腾作用加快

C.气孔的开闭能调节水分的蒸腾

D.增强空气湿度能使蒸腾作用加快

答案

蒸腾作用是水分从活的植物体内通过气孔(主要在叶片)以水蒸汽状态散失到大气中的过程,蒸腾作用不仅受外界环境条件的影响,而且还受植物本身的调节和控制.风速加大蒸腾作用加快,气温升高、日照增强,气孔开放,促使蒸腾作用加快;而空气湿度增大会导致蒸腾作用减弱.

我们把保卫细胞之间形成的凸透镜状的小孔称为气孔.气孔在呼吸、蒸腾作用等气体代谢中,成为空气和水蒸汽的通路,其通过量是由保卫细胞的开闭作用来调节,在生理上具有重要的意义.被称为植物蒸腾失水的“门户”,也是气体交换的“窗口”.因此气孔的开闭能调节水分的蒸腾.

故选D

写作题

读写任务。

阅读下面的短文,然后按照要求写一篇150词左右的英语短文。

     Be grateful for friends

     It is a celebrating day. I got in touch with Michael whom I have been losing contact for one year.

     It is really magic. I was searching online aimlessly yesterday when an idea struck me suddenly: since

Ben can find out my secret by keying in my name in the search engines, why can't I do so, either?

     I intended to find out something about Ben in revenge in the first place, but soon extend my name list

to a wider category. It was then that I recalled Michael suddenly.

     We have lost contact since our last correspondence in my Senior 3. He mentioned to me in his last

letter that he was preparing for going to UK to further his education. I, shamefully, was too busy to reply

his mail then. When I won the final freedom, I thought he had already been in UK so I had no idea where

to write him.

     I used to think that we would never meet again. However, when I browsed the entries about him, I

found out excitedly that he is still in China.

     Without a moment of hesitation, I ran upstairs to my dorm and found out my old address book. Thank goodness, his home number was still there.

     After 3 times calling with no answer replies, I eventually got him on the phone. He was more surprised

than I could imagine that when I asked for his home number he was too nervous to remember it.

      Life is enjoyable in moments such like this. Old friends meet again surprisingly, on a road of their

own ways to their dreams. They look at the face of each other, and recognize the old pal. It is such

moment that makes me feel grateful to life: whenever I set off for a new destination, I see I have friends

in the same direction, with whom I won't feel alone any more.

[写作内容]

1. 以约30词概括短文的要点;

2. 以约120词就“感恩”主题发表你的看法,包括以下的内容:

(1)根据你的学习、生活经历,简述你的感受,表达你对朋友或父母的感恩和祝福;

(2)你认为中学生应学会感恩;

(3)你的同学对此观点有何看法和建议。

[写作要求]

1. 可以使用真实实例来支持你的观点,也可以参照阅读材料的内容,但不得直接引用原文中的句子;

2. 标题自定。

[评分标准]

概括准确,语言规范,内容合适,篇章连贯。

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