А. Present Indefinite

A. Artificial immunity results of prophylactic vaccination.

Б. Artificial immunity is due to the formation of specific antitoxins.

В. Artificial immunity can be produced as the result from prophylactic vaccination.

Г. Immunity may be present only in certain persons.

Д. Immunity may not be present only in certain persons.
868. Finish the flowing sentence:

- Bodkin’s disease is an acute viral disease affecting …

A. Hepatic cells and bile ducts.

Б. Spleen and kidney

В. Bones and muscles.

Г. Stomach and intestine.

Д. Heart

869. In what word w is not pronounced?

A. Word

Б. Work

В. Worm

Г. Who

Д. Slow
870. In what word w is not pronounced?

A. White.

Б. What.

В. Whose.

Г. Why.

Д. When

871. Find the line of the nouns

A. Deep, attend, listen, clear.

Б. Successful, whole, need, numerous.