According to the passage, how many sudden deaths are reported all over the world

A．mental stress
B．physical diseases
C．unexpected accidents
D．poisons

A．Though the rocket is very small, it provides the pilot much fun.
B．The rocket belt can fly short distance and high into the sky as well.
C．The pressure causes the cylinder to move away.
D．By regulating the left handgrip, the pilot can land on earth gently.