试题与答案

下图是地球上水循环的一张示意图,请根据图示来回答问题: (1)绿色植物对地球上

题型:实验题

题目:

下图是地球上水循环的一张示意图,请根据图示来回答问题:

(1)绿色植物对地球上的水循环起到了重要作用。植物依靠     从土壤中吸收水分,植物吸收的水分大部分通过     作用散发到大气中去。

(2)蒸腾作用是指植物通过气孔将气体状态的水分从植物体内散发出去。气孔是由一对     细胞组成,是植物体内散发     和与外界进行     的“门户”。

答案:

(1)根  蒸腾  (2)保卫细胞   水分  气体交换

题目分析:(1)植物体通过根从土壤中吸收的水分,只有约1%参与植物体的构成,99%以上的水都通过蒸腾作用以水蒸气的形式从叶片的气孔散发到大气中去了,这不是对水的浪费,蒸腾作用有其重要的意义,一是为植物吸收水分提供了向上的动力,同时溶解在水中的无机盐也跟着一起被吸收和运输,二是蒸腾作用能提高大气的湿度,增加降水,三是蒸腾作用能带走植物体内的热量,使植物不至于在炎热的夏天被烤死,四是促进了生物圈的水循环。

(2)气孔是由保卫细胞之间形成的小孔,气孔在光合、呼吸、蒸腾作用等气体代谢中,成为空气和水蒸气的通路,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”,保卫细胞因外侧较薄而内侧较厚,保卫细胞吸水时,细胞膨胀,细胞厚度增加,两细胞分离,气孔张开,保卫细胞失水时,细胞收缩,细胞厚度减小,两细胞并合,气孔闭合,气孔正是通过保卫细胞的开闭来调节的,也直接影响到蒸腾作用的强度,使植物体内经常保持着适量水分。

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"I like it here," he added quietly over whiskey. "I would like to live here so many months of the year."

He already keeps a large flat in Grosvenor Square, where he is staying with his actress wife Sandie Grant and their three-year-old daughter Joanna. It has a studio where he likes to paint. Tony plans to have his first exhibition later in the year and he has already sold one picture for $4,000. At the end of the year Tony is to star in a musical film which has been specially written for him called "Two Bits", an informal expression for 50 cents. It's about an Italian immigrant(移民) who goes to America, but he becomes a failure.

"In many ways it's very close to my life the way the story has been written," said Bennett. "My father, an Italian, was ill and died when I was nine. He always wanted me to sing, but he never lived long enough to be a part of my success."

The film is to be made by Italy's top director Vittoria De Sica.

60. The underlined phrase "standard hit" in the first paragraph most probably means "_____".

A. Bennett's favorite song that's not very popular

B. a song that is always popular

C. a song which is like a heavy blow to his audience

D. a song which makes him standard

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A. "Two Bits" is a musical film.

B. Tony is to star in a film.

C. "Listen Easy" is a new record by Bennett.

D. "Listen Easy" has been published.

62. What does Tony Bennett want to do?

A. Buy a house and live in England.

B. Stay with his wife and daughter in England.

C. Live part of each year in England.

D. Leave America and settle in England.

63. What can we learn about Tony Bennett's father from this text?

A. He liked his son's singing.

B. He was born in Italy and died in America.

C. He was a part of Bennett's achievement.

D. He was glad that his son became famous.

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