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01.12.2021 15:50

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LINUS PAULING

Linus Pauling was the only person who (1)ever won two (unshared) Nobel

Prizes: for Chemistry in 1954, and a Nobel Peace Prize in 1962

And a lot of people who (2) in health and alternative medicine know him

as «the vitamin C man» because he shocked the world of science in the 1970s by

(3) that enormous amounts of vitamin C can keep us healthy.

(4) finishing his university course in chemical engineering, Pauling

(5) in physical chemistry in the 1920s and 1930s. He was interested in the

way that molecules are connected in crystals, and used physical techniques, such as

X-rays, (6) them. He also applied the ideas of quantum physics (a radical new

science at the time) (7) the study of chemistry. He used these new theories to solve problems that (8) explained before. His work at that time led to a lot

of the drugs, plastics and synthetic fibres that we (9) today.

Because of his interest in the way that molecules behave, Pauling slowly became more involved in biological chemistry, (10) physical chemistry. Through the

1930s and 1940s he began to work with organic substances, especially proteins. He made discoveries about the structure of proteins (11) were very important for diseases. Many people believe that he was near to discovering the structure of DNA at that time.

medicine. For example, they (12) to develop an artificial substitute for blood plasma. They also made important discoveries about some types of genetic

1) A. have B. has C. had D. having

2) A. are interested B. was interested C. were interested D. be interested

3) A. suggesting B. to suggest C. suggest D. suggested 5) A. work B. to work C. working D. worked 7) A. for B. in C. at D. to

4) A. Until B. Through C. Before D. After

6) A. study B. studies C. to study D. studied

8) A. have never been B. has never been C. were never been

D. had never been

9) A. know B. knew C. knows D. to know 11) A. which B. who C. what D. where 12) A. is able B. are able C. were able D. be able

10) A. as well as B. rather than C. in order to D. in spite