Лекция: Present simple

1. Transistor is a marvelous, virtually invisible _____________ _____________ that changed our lives.

2. The vacuum tube ____________ music and voice during the first half of the 20th century.

3. Transistors are made of semi-conductors such as _____________ and gallium arsenide.

4. Thanks to such techniques as photolithography and computer-aided _____________, millions of transistors and other _____________, _____________, complete with wiring, can be compactly organized on an integrated circuit smaller than a cornflake.

5. If to build the sequence of transistors in one way, chip can be made to amplify weak _____________ signals into rich quadraphonic hi-fidelity sound.

6. If transistors are arranged in a different array, arithmetic and _____________ logic processors can be created.

7. Scientists today know how to build _____________ materials virtually atom by atom, from a wide selection of materials.