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问题 单项选择题

FIDIC合同条件和我国《建设千程施工合同示范文本》（GF-99-0201）都规定，承包人必须在发出索赔意向通知后的（）天内或经过工程师同意的其他合理时间内向工程师提交一份详细的索赔文件和有关资料。

A．7

B．14

C．21

D．28

答案

参考答案：D

阅读理解
阅读理解。

                                                             How Long Can People Live?
       She took up skating at age 85, made her first movie appearance at age 114, and held a concert in the
neighborhood on her 121st birthday.
        When it comes to long life, Jeanne Calment is the world's recordholder. She lived to the ripe old age
of 122. So is 122 the upper limit to the human life span (寿命)? If scientists come up with some sort of pill
or diet that would slow aging, could we possibly make it to 150-or beyond?
        Researchers don't entirely agree on the answers. "Calment lived to 122, so it wouldn't surprise me if
someone alive today reaches 130 or 135," says Jerry Shay at the University of Texas.
        Steve Austad at the University of Texas agrees. "People can live much longer than we think," he says.
"Experts used to say that humans couldn't live past 110. When Calment blew past that age, they raised the
number to 120. So why can't we go higher?"
        The trouble with guessing how old people can live to be is that it's all just guessing. "Anyone can make
up a number," says Rich Miller at the University of Michigan. "Usually the scientist who picks the highest
number gets his name in Time magazine."
       Won't new anti - aging techniques keep us alive for centuries? Any cure, says Miller, for aging would
probably keep most of us kicking until about 120. Researchers are working on treatments that lengthen the
life span of mice by 50 percent at most. So, if the average human life span is about 80 year, says Miller,
"adding another 50 percent would get you to 120." 
       So what can we conclude from this little disagreement among the researchers? That life span is flexible
(有弹性的), but there is a limit, says George Martin of the University of Washington. "We can get flies to
live 50 percent longer," he says. "But a fly's never going to live 150 years." Of course, if you became a new
species (物种), one that ages at a lower speed, that would be a different story, he adds. 
       Does Martin really believe that humans could evolve (进化) their way to longer life? "It's pretty cool to
think about," he says with a smile.

1. What does the story of Jeanne Calment prove (证明) to us?
[ ]
A. People can live to 122.
B. Old people are creative.
C. Women are sporty at 85.
D. Women live longer than men.
2. According to Steve Austad at the University of Texas, _______.
[ ]
A. the average human life span could be 110
B. scientists cannot find ways to slow aging
C. few people can expect to live to over 150
D. researchers are not sure how long people can live
3. What can we infer (推断) from the last three paragraphs?
[ ]
A. Most of us could be good at sports even at 120.
B. The average human life span cannot be doubled.
C. Scientists believe mice are aging at a slower speed than before.
D. New techniques could be used to change flies into a new species.
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单项选择题

爆炸性物质能够进行化学爆炸变化的能力取决于反应的放热性、（）、生成气体产物三大因素。

A、反应的快速性

B、爆炸性物质的爆炸上限

C、反应的有效性

D、爆炸性物质的爆炸下限
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