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Some people consider______cruel to use animals for experiment.
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What did the man give the woman？
How is clean water brought to our homes？
It was not an easy process. Voss was actually passed over when he first applied for the astronaut program in 1978. Over the next nine years he reapplied repeatedly, and was finally accepted in 1987. Since then he has participated in three space missions. The 50-year-old Army officer, who lives in Houston, is now in training for a four-month mission as a crew member on the International Space Station starting in July 2000.
Voss says the ASEE program is wonderful for all involved. "It brings in people from the academic world and gives NASA a special property for a particular period of time. It brings some fresh eyes and fresh ideas to NASA, and establishes a link with our colleges and universities," Voss explains. "There's an exchange of information and an exchange of perspectives that is very important."
For the academic side, Voss says, the ASEE program also "brings institutions of higher learning more insight into new technology. We give them an opportunity to work on real-world problems and take it back to the classroom".
Why was the hydraulic fuel pump seal important for the space shuttle？
听力原文： The World Heritage Committee (WHC) overlooking conservation of global heritage sites will convene its annual meeting next week in Durban, South Africa, to review 42 proposed sites for inscription on the prestigious World Heritage List.
Extensions for nine sites that have already been inscribed will also be proposed during the 29th session of the WHC under the United Nations Educational, Scientific and Cultural Organization (UNESCO), according to the organization's official website.
The proposed sites include 28 cultural sites, 10 natural sites and 4 mixed sites presented by 44 countries, including Albania, China and the host country South Africa.
How many cultural sites have been proposed for inscription on the World Heritage List？
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