Tense and change accordingly the Tense of the subordinate clause:
a) We are informed that many scientists are working at the problem of radioactivity.
b) Newspapers write that atomic radiation is very harmful and that, therefore, the stopping of H - bomb tests will greatly contribute to human health.
c) The United Nations scientific committee reports that every nuclear test contaminates the world by radioactivity and increases the danger to human life.
d) Scientists announce that they have discovered important properties of radioactive substances.
e) People are sure that soon a spaceship will fly to other planets.
f) Our first astronauts say that many astronauts are being trained for space travels.
g) The students say they solve many important problems in the field of physics.
h) The lecturer says that every element is made up of minute particles, which are called atoms.
i) Scientist says he writes articles on the development of science and technology.
j) It is known that electronics is becoming increasingly important in all branches of production.
Lesson Two
I. Pre-text Exercises
1. Learn the meaning and pronunciation of the following words:
convert [kənˈvə:t], oscillation [ɔsi'leiʃn], audible ['ɔ:dəbl], incoming [ˈinkΛmiŋ], video ['vidəou], intelligible [in'telidʒəbl], indiscriminately [indis'kriminitli], intermediate [intə'mi:djət], excessive [ik'sesiv].
2. Read and remember the plural of the following nouns:
maximum ['mæksiməm] — maxima ['mæksimə]
medium ['mi:diəm] — media ['mi:diə]
minimum ['miniməm] — minima ['minimə]
quantum ['kwɔntəm] — quanta ['kwɔntə]
Ï. Read the following text carefully, while vou are reading look for the answers to the questions:
1. What are the essential components of a radio receiver?
2. What is the dominant consideration in receiver design?
3. What are the principal characteristics of a good radio receiver?