— What are you going to do this Saturday?
— There _______ an English party in our school. I'm going to take part in it.
A:is going to be
B:is going to have
C:is
D:are
命题“∀n∈N*,f(n)∈N*且f(n)≤n”的否定形式是( )
鱼能在水中生存的原因是( )