单项选择题

According to the passage, sudden deaths are probably caused by ______.

A．mental stress
B．physical diseases
C．unexpected accidents
D．poisons
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单项选择题
Which of the following is not stated in the passage
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.
单项选择题
This passage could be entitled ______.
A．Rockets
B．Principles of Rocket
C．Cylinder
D．The Rocket Belt
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