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Listen and decide whether the facts from the lecture are true or false
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1. In 1989, biochemists John Haldane and Aleksander Oparin hypothesized independently that Earth's early atmosphere lacked free oxygen.
2. Basic organic compounds are proteins and nucleic acids.
3. The ocean in the experiment was represented by a warmed plate with water.
4. Organic compounds could form from simple molecules if stimulated by lightning.
5. The Earth's early oxygen-free atmosphere was mostly composed of helium, methane and ammonia.
6. Amino acids are the building blocks of proteins.
33. 
In 1958, President Eisenhower signed the Space Act, officially creating the National Aeronautics and Space Administration. From the beginning, the purpose for the new branch extended beyond space ships and moon boots. The law stipulated that its research and advancements should benefit all people, and in its 50-year history, NASA has certainly fulfilled that role.
Listen to the description of two NASA by-products – smoke detector and cordless tools − and complete the sentences with information from the description.
1. NASA invented the first adjustable smoke detector with different sensitivity levels …….
2. The ionization smoke detector uses a radioactive element to spot ………
3. The americium-241 ionizes clean air particles, which creates ………
4. Black & Decker invented the first battery-powered tools in ……...
5. NASA needed a tool that astronauts could use to obtain samples …………
6. Black & Decker’s computer program for the tool reduced the amount of power expended during use to …….…
Дата публикования: 2014-11-04; Прочитано: 426 | Нарушение авторского права страницы | Мы поможем в написании вашей работы!
