题干

通过对生物体结构的了解,我们会发现生物体的结构与功能是相适应的.下列不符合这种观点的选项是( )

A:栅栏组织细胞排列紧密,含有的叶绿体和叶绿素多,利于进行光合作用

B:玉米的雄花花粉多而轻,雌花的柱头分叉且有黏液,利于完成传粉

C:人的心脏四腔中左心室壁最厚,利于血液输送到全身各部分

D:人体的静脉都有静脉瓣,可以防止血液倒流

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答案(点此获取答案解析)

D

同类题1

阅读理解

    The story of Sir Nicholas Winton is the one that you would imagine could only happen on the silver screen. Sir Nicholas Winton was a British man who went to heroic efforts, potentially putting himself at risk, during World War II. Sir Winton was responsible for ensuring the safety of 669 Jewish children by aiding their escape from countries occupied by Nazis. Finally, the Jewish children were brought to England where he worked to make sure families in his native country would help the kids by taking them into their homes.

    Recently, this unbelievable story has again been making the rounds on the Internet, particularly after a rerun of the BBC show called "That's Life", which featured Sir Winton. People around the world were moved at the details of the story, with saying it to be the best story they've ever seen.

    Sir Winton kept his entire plan completely secret, even his wife had no idea about his planning until fifty years later. After the war, years passed and many people remained in the dark about Sir Winton's extraordinary achievement. Some fifty years later, his wife Greta was searching in their house and discovered a Winton's notebook which documented the names of all the children. She worked with BBC and they produced a TV episode(插曲) of their program "That's Life" that served as an honor for Sir Winton's work.

    In 2003, Sir Winton was knighted by the Queen of England for his work. He also was even nominated for a Nobel Peace Prize. He also had a small planet named after him by Czech astronomers. Sir Winton died peacefully in his sleep at the old age of 106, in 2015. Leaders around the world paid tribute(悼念). Israel's ambassador to the United Kingdom, Daniel Taub, said, "He was a hero of our time, having saved 669 Jewish children from Nazis. His story, as a point of light in a period of darkness, will forever be remembered."

同类题5

根据短文理解,选择正确答案。

    Anny was a five-year-old girl. One day when she and her mother were in a department store(百货商店), Anny saw a plastic pearl necklace (珍珠项链). What a beautiful necklace! She wanted it very much, so she begged(乞求)her mother to buy it for her. The mother said, “Well, I can buy you the necklace, but when we get home, we should discuss what you can do to pay for it. Can we do that?” Anny agreed with much happiness, and she got the necklace.

    How much Anny loved the necklace! She wore it everywhere and every minute. Anny also did part - time jobs to make pocket money. She worked very hard. Soon she succeeded in paying off the price for the necklace.

    Anny's daddy knew how she tried her best to get the necklace. He also knew how much Anny cared about it. One night, he asked Anny if she loved him. “Sure, Daddy.” the little girl said. “Then how about giving me your necklace?” “Oh, no, Daddy! Not my necklace!” Anny cried. “Oh, dear, it's fine.” her father gave her a kiss.

    Several days later, Anny went to her daddy, with her lips(嘴唇) trembling(颤抖). “Here, Daddy. I love you.” She held out her hand. Inside it was the plastic pearl necklace that she loved so much.

    When he saw this, Anny's father smiled with surprise. He then pulled a cute box out of his pocket. Inside the box was a real and colourful pearl necklace, which was waiting for Anny for so long.