单项选择题

In bungee jumping, you ()

A. jump as high as you can
B. slide down a rope to the ground
C. tie yourself to a rope and fall
D. f all without a rope

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单项选择题Which of the following is true()

A. People walled their yards with fences.
B. The settlers in early years needed their neighbors’ help very much.
C. People get used to American openness.
D. It is difficult to follow the American way of life.

单项选择题Why blue lights are installed in many train stations()

A. Because they do not hurt human eyes.
B. Because they are cheaper than regular ones.
C. Because they can help people at night.
D. Because they can reduce the number of suicides.