问题 填空题

家用管道煤气是一种常见的燃料,它的主要成分是一氧化碳.一氧化碳是一种无色无味的有毒气体,为了防止煤气中毒,人们有意在煤气里加入少量有强烈刺激性气味的气体----乙硫醇(C2H5SH).当煤气泄露时,人们可以根据乙硫醇的气味察觉到煤气的泄露,以便及时采取措施.在标准状况下,一氧化碳难溶于水,密度为1.250g/L,比空气的密度略小.一氧化碳有剧毒,因为它能与血液中的血红蛋白结合,使人体缺氧.一氧化碳能在空气中燃烧生成二氧化碳.根据阅读回答:

(1)一氧化碳的物理性质有______;

(2)一氧化碳的化学性质有______.

答案

(1)一氧化碳的颜色、气味、水溶性、密度等方面的性质不需要通过化学变化表现出来,属于物理性质.故填:无色无味的气体,一氧化碳难溶于水,密度为1.250g/L.

(2)一氧化碳具有可燃性,有剧毒等方面的性质需要通过化学变化表现出来,属于化学性质.故填:可燃性,毒性.

阅读理解

阅读理解。

     If you were to walk up to Arthur Bonner and say, "Hey, Butterfly Man," his face would break into a smile.

The title suits him. And he loves it.

     Arthur Bonner works with the Palos Verdes blue butterfly (蝴蝶), once thought to have died out. Today the

butterfly is coming back-thanks to him. But years ago if you'd told him this was what he'd be doing someday,

he would have laughed," You're crazy." As a boy, he used to be "a little tough guy on the streets". At age

thirteen, he was caught by police stealing. At eighteen, he landed in prison for shooting a man.

     "I knew it had hurried my mom," Bonner said after he got out of prison. "So I told myself I would not put

my mom through that pain again."

     One day he met Professor Mattoni, who was working to rebuild the habitat (栖息地) for an endangered

butterfly called El Segundo blue.

     "I saw the sign 'Butterfly Habitat' and asked, 'How can you have a habitat when the butterflies can just fly

away?'" Bonner recalls. "Dr. Mattoni laughed and handed me a magnifying glass (放大镜), 'Look at the leaves.'

I could see all these caterpillars (蝴蝶的幼虫) on the plant. Dr Mattoni explained, 'Without the plant, there are

no butterflies.'"

     Weeks later, Bonner received a call from Dr. Mattoni, who told him there was a butterfly needed help. That

was how he met the Palos Verdes blue. Since then he's been working for four years to help bring the butterfly

back. He grows astragalus, the only plant the butterfly eats. He collects butterflies and brings them into a lab to

lay eggs. Then he puts new butterflies into the habitat.

     The butterfly's population, once almost zero, is now up to 900. For their work, Bonner and Dr. Mattoni

received lots of awards. But for Bonner, he earned something more: he turned his life around.

     For six years now Bonner has kept his promise to stay out of prison. While he's bringing back the Palos

Verdes blue, the butterfly has helped bring him back, too.

1. When he was young, Arthur Bonner _____.

A. broke the law and ended up in prison

B. was fond of shooting and hurt his mom

C. often laughed at people on the streets

D. often caught butterflies and took them home

2. Bonner came to know the Palos Verdes blue after he _____.

A. found the butterfly had died out

B. won many prizes from his professor

C. met Dr. Mattoni, a professor of biology

D. collected butterflies and put them into a lab

3. From the last sentence of the text, we learn that raising butterflies has _____.

A. made Bonner famous

B. changed Bonner's life

C. brought Bonner wealth

D. enriched Bonner's knowledge

4. Which of the following would be the best title for the text?

A. A Promise to Mom

B. A Man Saved by Butterflies

C. A Story of Butterflies

D. A Job Offered by Dr. Mattoni

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