Думаю, дело в том, что в данном случае это не сюрприз как вещь (исчислимое), а удивление - неисчислимое. Артикль "a" заменяет слово one, к ситуации не подходит. Т.е. surprise можно заменить на astonishment, оно бы тоже было неисчислимым.
The Russian Federation is the official name of our country
May is the fifth month of the year. July is the seventh month of the year. August is the eighth month of the year. October is the tenth month of the year. December is the twelfth month of the year.
school, dmiti in mathematics, physics, and geography but was not good at languages. in 1855 he graduated from pedagogical institute in st peterburg with a gold medal fo his 1856,he in chemistry. dmitri mendeleev's contribution to the world's science was was the first the dependence of the qualities of the elements on their atomic weight. he forecast that the gaps in the table of elements
would be filled in by elements whith yet. dmitri mendeleev was greatly honoured as a of academies in many countries. elements no 101 him.