| More than a year has passed since the
space shuttle Columbia broke into pieces over central Texas. This past January
President Bush announced a long-term program of space exploration that would
return human beings to the Moon, and thereafter send them to Mars and beyond. As
this magazine (Natural History) goes to press, the twin Mars Exploration Rovers,
Spirit and Opportunity, are wowing the scientists and engineers at the rovers’
birthplace--NASA’s Jet Propulsion Laboratory (JPL)--with their skills as robotic
field geologists. JPL’s official rover Web site is being stampeded by visitors.
The confluence of these and other events resurrects a perennial debate: with two
shuttle failures out of 112 missions, and the astronomical expense of the manned
space program, can sending people into space be justified, or should robots do
the jo A. hacked severely B. clicked frequently C. closed forever D. neglected purposely [填空题]The book has more than one author.
[填空题]Who has owned more than 50 domain names
A. A．George W. Bush B．Kelsey Grammar C．Bonita Card. [单项选择]More than a year has passed since the space shuttle Columbia broke into pieces over central Texas. This past January President Bush announced a long-term program of space exploration that would return human beings to the Moon, and thereafter send them to Mars and beyond. As this magazine (Natural History) goes to press, the twin Mars Exploration Rovers, Spirit and Opportunity, are wowing the scientists and engineers at the rovers’ birthplace--NASA’s Jet Propulsion Laboratory (JPL)--with their skills as robotic field geologists. JPL’s official rover Web site is being stampeded by visitors. The confluence of these and other events resurrects a perennial debate: with two shuttle failures out of 112 missions, and the astronomical expense of the manned space program, can sending people into space be justified, or should robots do the job alone
Modern societies have been sending robots into space since 1957, and people since 1961. Fact is, it’s vastly cheaper to send robots: in most cas A. A．1) most probably means ______ . hacked severelyB. clicked frequentlyC. closed foreverD. neglected purposely [填空题]In our country, more and more people have now come to{{U}} (11) {{/U}}the harm tobacco does to{{U}} (12) {{/U}}, and they have made louder and louder appeal to the public for the ban on tobacco smoking{{U}} (13) {{/U}}. In order that we Chinese people could live in an environment with its air{{U}} (14) {{/U}}as possible and suffer from the harm caused by air pollution as little as possible, we suggest that the related departments should{{U}} (15) {{/U}}concerning the ban on tobacco smoking in public places.
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