试题与答案

设NA为阿伏加德罗常数的值。下列说法正确的是 A.25℃时,pH=13的氨水中含

题型:选择题

题目:

设NA为阿伏加德罗常数的值。下列说法正确的是

A.25℃时,pH=13的氨水中含有OH的数目为0.1NA

B.标准状况下,2.24 LNO2与水反应生成NO3的数目为0.1NA

C.1 mol Na被完全氧化生成Na2O2,转移电子的数目为NA

D.4.0 g H2与足量O2完全反应生成水,反应中断裂共价键的总数为2NA

答案:

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题型:阅读理解

阅读理解。

    Paula Radcliffe, chasing (角逐) a third London marathon title (冠军), says she has

become a stronger person after her terrible experience at the 2004 Athens Games.

    Radcliffe, who failed to complete the Olympic marathon and the 10,000m last August,

said:"Athens made me a stronger person and it made me care about criticism (批评)."

    "In the past I wanted to please everyone, but now I am going to listen even more to

the people around me."

    She didn't care about criticism made at the weekend by Liz McColgan, who felt Radcliffe

should have rested and let her body recover after her failure in Athens.

    "Liz is someone I look up to but she hasn't spoken to me since last year and if she

really cared for me, I'm sure she would have contacted (联系) me."

    Instead Radcliffe won the New York City marathon just 11 weeks after Athens.

    "In New York I wasn't in my best state but I did know I was good enough to win the

race."

    Radcliffe insisted her only goal in Sunday's race would be winning a third title and

not chasing world records.

    However, Radcliffe has not ruled out (排除) in the future chasing her "final" world

record time and questioned sayings that marathon runners have the ability in their career

to produce only four or five world-class times.

    "I don't think that-although I can't put a number on it," said Radcliffe. "That changes

from person to person."

    Radcliffe is sure she can better her winning London 2003 performance some point in the

future. Following a successful three-month training period in the United States, the

31-year-old will chase a third title on Sunday after her first victory in 2002 and again

12 months later.

    Radcliffe clocked a time 2:18:56 in her first 42.2-kilometre race three years ago.

    Afterwards she set a "mixed course" mark of 2:17:18 five months later in Chicago before

lowering that to a time of 2:15:25 in the 2003 London event.

1. Radcliffe's failure in Athens made her _____. [ ]

A. face criticism bravely

B. rest for five months

C. love people around her more

D. develop respect for Liz

2. Which of the following is true according to the passage? [ ]

A. Radcliffe broke the world record in the New York City marathon.

B. Radcliffe didn't fully recover before the New York City marathon.

C. Radcliffe won her first marathon title in the 2004 Athens Games.

D. Radcliffe had a 3-month training before the New York City marathon.

3. According to the text, Radcliffe has won _____ London marathon title(s). [ ]

A. one

B. two

C. three

D. four

4. What can we learn from Radcliffe's story? [ ]

A. Practice makes perfect.      

B. Well begun is half done.

C. A friend in need is a friend indeed.

D. Where there is a will, there is a way.

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