更多"For more than thirty years scientis"的相关试题:
[单项选择]For more than thirty years scientists have been searching for signs of life on other planets. Most of these searches have been done over the radio. The hope is that someone in outer space may be trying to get in touch with us. Scientists also have sent radio and television messages, as well as messages on spaceships traveling through space, on the chance that someone may be receptive to such messages.
Scientists are using powerful radio telescopes to "listen" to signals from about 1,000 stars, all within 100 light years of the earth. In addition, they will scan the entire sky to listen for radio messages from more distant stars. Using a computer, they will be able to monitor more than eight million channels at a time. Scientists are looking for any signal that stands out from the background noise.
Of the 200 billion stars in the Milky Way galaxy, scientists find that five percent of the stars are like our sun. Perhaps half of them have a planet like the earth. Such a p
A. have sent up spaceships to other planets
B. have sent radio and television messages to outer space
C. are listening to the radio message all the year round
D. will use computers to pick up background noise
[填空题]More than 3 nature reserves have been established in this area where hunting (forbid) ______.
[填空题]There have been men for more than
[填空题]More than one thousand years ago, students were sent to Japan to study Confucianism.
[填空题]More than forty women have been killed in the war in Iraq. Hundreds of others have been (47) . The war began in March of 2003. Two (48) published books tell two different stories of women who served in Iraq.
One is by Janis Karpinski. She was the Army general who (49) military police at prisons in Iraq. These included the Army Reserve soldiers who (50) the Abu Ghraib Prison near Baghdad.
Some have received prison (51) for mistreating prisoners at Abu Ghraib. Miz Karpinski became the highest-level officer to be punished in connection with the (52) . She left the service in July after being reduced from a brigadier general (准将) to a colonel (上校).
Her book is called "One Woman’s Army: The Commanding General of Abu Ghraib Tells Her Story." Miz Karpinski says she was unfairly blamed for conditions beyond her control. She also tells of her difficulties as a rising woman (53) in the Army.
[单项选择]For more than 40 years, Earth has been sending out distress signals. At first they were subtle, like the thin shells of bald-eagle eggs that cracked because they were laced (使混合) with DDT. Then the signs were unmistakable, like the covering of smoke over the Amazon rain forest, where farmers and ranchers (牧场主人) set fire to clear land. Finally, as the new millennium drew near, it was obvious that Earth’s pain had become humanity’s pain. The collapse of the North Atlantic cod (鳕鱼) fishery put 30,000 Canadians out of work and ruined the economies of 700 communities. In 1998, deforestation worsened China’s floods, which killed 3,600 people and left 14 million homeless. Population pressures and overcrowding raised the toll from 1999’s rains in Latin America, which killed more than 30,000 people and created armies of environmental refugees.
And how have we responded to four decades of ever louder distress signals We’ve staged a procession, of Earth Days, formed Green parties, passed env
A. people of all nations become conscious of the danger and make joint efforts.
B. governments in developed countries can formulate more strict laws and regulations.
C. more volunteers can be organized to help the refugees throughout the world.
D. the living standards of citizens in developing countries can be greatly raise
