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Задание C3AA3C по Английский ЕГЭ

The author tends to trust the information about gold colloid because …; the number of atoms in particles is known.; it helped with his rheumatoid arthritis.; he’s a specialist in colloids.; it’s backed by some research.

The author tends to trust the information about gold colloid because …

 1) 

the number of atoms in particles is known.

 2) 

it helped with his rheumatoid arthritis.

 3) 

he’s a specialist in colloids.

 4) 

it’s backed by some research.

Подсказка
Задание №4. Выберите правильный ответ.