[填空题]For most of the 20th century, there has been life on Mars. Or, at least in the minds of the Earthlings, who live on its closest planetary neighbor. But could life exist on Mars, given that it is a very (36) world from what it was 3.8 billion years ago It has (37) no atmosphere. It has a barren surface, which is bathed in ultraviolet (38) from the Sun, and there is no liquid water on the surface of the planet (although there are ice caps at its poles. ) Mars had moved from a warm, wet place—a likely home for life—to a dead world of dust storms, (39) and vast canyons. It happened because its carbon dioxide atmosphere could not remain (40) in a wet environment. Carbon dioxide reacted with rocks, and it was rapidly absorbed by water, where it became solid carbonates (碳酸盐) and (41) to the bottom of seas. It is a greenhouse gas, which (42) heat from the Sun. As it disappeared from the Martian atmosphere, the Planet

[填空题]For most of the 20th century, there has been life on Mars. Or, at least in the minds of the Earthlings, who live on its closest planetary neighbor. But could life exist on Mars, given that it is a very (36) world from what it was 3.8 billion years ago It has (37) no atmosphere. It has a barren surface, which is bathed in ultraviolet (38) from the Sun, and there is no liquid water on the surface of the planet (although there are ice caps at its poles. ) Mars had moved from a warm, wet place—a likely home for life—to a dead world of dust storms, (39) and vast canyons. It happened because its carbon dioxide atmosphere could not remain (40) in a wet environment. Carbon dioxide reacted with rocks, and it was rapidly absorbed by water, where it became solid carbonates (碳酸盐) and (41) to the bottom of seas. It is a greenhouse gas, which (42) heat from the Sun. As it disappeared from the Martian atmosphere, the Planet

[单项选择]Department Store Magic
For most of the 20^th century Smithson’s was one of Britain’s most successful department stores, but by the mid-1990s, it had become dull. Still profitable, thanks largely to a series of successful advertising campaigns, but decidedly boring. The famous were careful not to be seen there, and its sales staff didn’t seem to have changed since the store opened in 1908. Worst of all, its customers were buying fewer and fewer of its own brand products, the major part of its business, and showing a preference for more fashionable brands.
But now all the has changed, thanks to Rowena Baker, who became Smithson’s first woman Chief Executive three years ago. Since then, while most major retailers in Britain have been losing money, Smithson’s profits have been rising steadily. When Baker started, a lot of improvements had just been make to the building, without having any effect on sales, and she took the bold decision to invite one of Europe’s most
A. was making a loss.
B. had a problem keeping staff.
C. was unhappy with its advertising agency.
D. mostly sold goods under the Smithson’s name.

[填空题]

If the 20th century has been the American century, then there are plenty of people saying watch this space: the twenty first century will be different. The distinguishing characteristic of the post-cold-war world is that there is only one super power. 41) _______________.
The military muscle-flexing we have seen from China over the last few years could be an indication of how things are likely to go, although it has to be said that to many people’s surprise the Chinese have been quite constructive over East Timor. But I think we must assume that the main struggle in the 21st century will be with China, already the world’s largest nation. Happily, the Chinese seem to have no global pretensions. One can’t see them interfering in some far-distant conflict, and in both military and economic terms they are still light years behind America.
42) _______________.
Europe is already the largest trading block in the world, 43) _______________. . It&