[单项选择]When something happens to shake our culture—like the terrorist attacks—we pause, not merely from fear. A deeper self-examination is going on all over the country. And love, family and faith are emerging.
Single people are flocking to dating services, looking for committed relationships. Bridal retailers report a surge in sales. Sales of old-fashioned board games have skyrocketed.
The new appreciation for time spent with those we love poses a great spiritual question to materialistic yuppies and workaholic careerists, and that question is this: "Was your life before September 11 really working for you" To many, the answer is no.
We once heard of a CEO who spoke at his retirement dinner to a group of your executives. He said, "I know you want my job, and I’ll tell you how to get it. Last week my daughter was married, and as she walked down the aisle, I realized I did not know the name of her best friend, or the last book she read, or her favorite color. That’s the price I
A. refiecting on the reason for the attacks
B. checking up on one’s physical condition
C. looking Into one’s values and attitudes
D. confronting painful reality

When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain how exactly dying stars could blow away these clouds. Now astrophysicists propose that unexpected chemical reactions during the formation of stardust could help solve this mystery.
Stars smaller than the Sun and up to eight times as massive die by swelling up into red giants before shedding most of their mass to shrink into very compact, dying embers (灰烬) called white dwarfs. Two kinds of red giants exist-those with lots of carbon, and others richer in oxygen than in carbon. Carbon-rich stars release carbon particles during their death throes. Scientists proposed these pitch-black grains absorb rays from the dying star and get shot into space by starlight, a theory that fit both the observations and computer models.
Increasingly, however, researchers could not explai
A. explain-the possible way of death of our Sun.
B. show the two types of red giants.
C. discuss on the way of red giants to become white dwarfs.
D. explore the origin of life.

Generally, luck is something that happens to individuals. If a society or a century is considered as a whole, the random individual events that are set down to luck or fortune form more coherent overall patterns; large historical forces become discernible. But entire societies should not mock luck either. (46)The classic Mayan civilization disappeared so strangely, so unexpectedly, that some massive stroke of bad luck must have been at work--a sudden plague, say, a viral riot.
Of all civilizations, America seemed the luckiest. With its vast spaces and immense natural wealth, with its extraordinary freedom from the stultifications of caste and poverty, the place seemed born in luck. (47)Or so it appeared to the white Europeans who settled the continent, if not to the Indians they violently displaced or the Africans they imported in slave ships to work the plantations. Americans eventually made the mistake of de- scribing their national luck as their "man