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【单选题】

Passage Four
Politically, the nations of the world will become more tightly integrated because of rapidly improving telecommunications and transportation. A global culture will develop rapidly as the nations colonize each other. The emerging global culture will pick and choose its clothing style, culinary (烹饪用的) specialties, drinks, s, sports, customs, and other cultural artifacts from countries everywhere.
A network of superhighways will link up the nations of Asia, Europe, and Africa Macroengineers now are talking enthusiastically about a tunnel under the Mediterranean at Gibraltar (直布罗陀) to link Europe with Africa. Construction might start early in the twenty-first century, but financing such a project poses a major challenge.
Meanwhile, superhighways will crisscross the Eurasian land mass, allowing residents of Shanghai and Hong Kong to drive comfortably and rapidly to Paris, Rome, and Stockholm. Travelers in a hurry will, of course, still prefer to fly, especially over long distances. Space-planes should be in service within the next 20 years, flights from Tokyo to New York in only a couple of hours. On the ground, high-speed maglev trains (磁悬浮火车) will whisk passengers to their destinations.
Humans will push out the frontiers of human settlement in all directions. The moon will acquire its first permanent base, and perhaps the first Lunarians (月球居民) will be born. The human population living in space will rise steadily, as manufacturing develops abroad spacecraft and the resources of asteroids (小行星) are explored.
Advancing technology will also solve many of the problems of living and working in unfriendly environments on Earth, so the population of Antarctica and the polar regions will climb steadily. The forbidding Himalaya Mountains may experience a development boom, including, perhaps, luxury hotels for tourists on once-forbidding Mount Everest.
The pace of ocean development will speed up. Ocean farming will become increasingly attractive as food prices rise. Studies have shown that the biological productivity of the ocean can be greatly increased by adding certain chemicals. An "ocean rush" could develop, and coastal nations with extensive ocean claims stand to benefit. However, conflicts between nations over ocean resources will likely intensify.
Which means are mentioned as faster means of transportation in the future

A.
Cars, space planes, maglev trains.
B.
Planes, maglev trains.
C.
Rockets, maglev trains.
D.
Space planes, maglev trains.
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【多选题】下列关于磁悬浮哪项是正确 ( )

A.
中低速磁浮系统车辆载荷相对均衡、车辆费用较高、属于中运量交通方式
B.
中低速磁浮系统噪音较大、与其他轨道相比维护费用较少
C.
2019年青岛下线高速磁悬浮列车运行速度可达到600 km/h
D.
2018年大连下线中低速磁浮半径不小于50m;160km/h
E.
成都启动超铁属于高速速磁浮

【单选题】Unless we spend money to spot and prevent asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星) that...

A.
It is very unlikely, but the danger exists.,
B.
Such a collision might occur once every 25 years.
C.
Collisions of smaller asteroids with Earth occur more often than expected.
D.
It’s still too early to say whether such a collision might occur.