1945年，向日本的广岛、长崎投掷原子迫使日本帝国主义早日投降的国家是 [ ]

如果圆和正方形的周长相等，那么圆的直径一定大于正方形的边长．______．（判断对错）

人口年龄结构是反映一个地区人口状况的重要指标之一，一般把65岁及其以上人口达到7%视为进入老龄化社会。图2为1964～2000年中国人口年龄构成变化图，据图回答小题。

小题1:关于我国人口年龄构成变化的正确叙述是：                            

A．15～64岁年龄段人口增长速度最快

B．0～14岁年龄段人口比重持续增加

C．65岁及以上年龄段人口增长速度最快

D．1990年我国已进入老龄化社会小题2:进入2000年，我国面对的主要人口问题是：                              

A．青壮年人口数量庞大，就业压力大

B．人口自然增长率偏高，每年新增人口多

C．人口老龄化日趋严重，劳动力严重短缺

D．人口出现负增长，人口数量日趋减少

据报道，每百吨核聚变所释放出的能量相当于目前人类一年消耗的能量，在地球上氦元素主要以的形式存在。有关该元素说法正确的是

A．原子核内有4个质子

B．和互为同位素

C．原子核内有3个中子

D．最外层只有2个电子故具有较强的金属性

While success is surely sweeter than failure, it seems failure is a far better teacher, and organizations that fail spectacularly often flourish more in the long run, according to a new study by Vinit Desai, assistant professor of management at the University of Colorado Denver Business School. Researchers have found that people missing their goals perform much better in the long run. That is because they gain more knowledge from their failures than their successes and the lessons are more likely to stay longer in their minds.

“We found that the knowledge gained from success was often fleeting while knowledge from failure stuck around for years,” said professor Desai, who led the study. “But companies often ignore failure. Managers may fire people or turn over the whole workforce while they should treat the failure as a learning opportunity.”

Prof Desai compared the flights of the space shuttle Atlantis and the Challenger. During the 2002 Atlantis flight, a piece of insulation (绝缘体) broke off and damaged the left solid rocket booster (助推火箭) but didn’t influence the program. There was little investigation. The Challenger was launched next and another piece of insulation broke off. This time the shuttle and its seven–person crew were destroyed. The disaster led to a major investigation resulting in 29 changes to prevent future disasters.

The difference in response in the two cases came down to this: Atlantis was considered a success and the Challenger a failure.

“Despite crowded skies, airlines are extremely reliable,” he said. “The number of failures is extremely small. And past researches have shown that older airlines, those with more experience in failure, have a lower number of accidents.”

Prof Desai doesn’t recommend finding out failure in order to learn. Instead, he advises organizations to analyze small failures to collect useful information rather than wait for major failures.

小题1:Why did experts pay little attention to the problem of Atlantis?

A．Because it worked perfectly.

B．Because the right booster was still OK.

C．Because nothing serious happened then.

D．Because fewer people died in the flight.小题2:Fewer accidents happen to older airlines in that _____.

A．their planes couldn’t fly high in the sky

B．they gained much from experience in failure

C．their planes were often checked by the experts

D．they were unpopular among passengers小题3:The passage is written mainly to _____.

A．show failure is a better teacher than success

B．explain why Challenger failed

C．introduce something about Prof Desai

D．tell managers how to achieve success小题4:Which writing strategy is NOT used in developing the passage?

A．Giving definitions.

B．Making comparisons.

C．Analyzing causes.

D．Providing different examples.

“A house divided(分裂、裂开)against itself can not stand．”这句名言出自美国历史上一个著名的总统，请问他是（  ）

A．罗斯福

B．林肯

C．华盛顿

D．杜鲁门