Exercise 2.9. Change the sentences into the Passive Voice. 1. Modern computers can solve a great variety of tasks. 2. The
specialists introduced computer graphics in the 1959s. 3. Mainframes
control businesses and industrial facilities. 4. Supercomputers process
complex and time-consuming calculations, such as those used to create
weather predictions. 5. Computers use a form of digital information
called binary information. 6. Analog computers perform mathematical
operations on continuous electric values. 7. The demand for better
computational techniques caused a resurgence of interest in numerical
methods and their analysis. 8. A computer can take the information,
perform different operations and provide answers. 9. Electronic
devices have revolutionized our life. 10. We may consider a hybrid
computer as a combination of digital and analog ones. 11. We use
communication devices to send information to or from external
storage. 12. Today computers have profoundly changed the way in
which people do many kinds of work. 13. The input devices receive
signals from the control unit.

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Объяснение:

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Alternative energy is a set of promising methods of obtaining, transferring and using energy (often from renewable sources), which are not as widespread as traditional ones, but are of interest because of the profitability of their use with, as a rule, a low risk of causing harm to the environment.

Объяснение:

Альтернати́вная энерге́тика — совокупность перспективных получения, передачи и использования энергии (зачастую — из возобновляемых источников), которые распространены не так широко, как традиционные, однако представляют интерес из-за выгодности их использования при, как правило, низком риске причинения вреда окружающей среде.