单项选择题

It is customary to leave a house

A．through the kitchen window
B．through a bedroom
C．by the door
D．down a drain-pipe
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单项选择题
The best statement of the main idea of this passage is that ______.
A．Captain Nash saw twelve orange lights moving at a fantastic rate of speed
B．Captain Nash may have been the first to see such lights in space
C．according to an interesting theory, the orange lights are space animals
D．the mysteries of nature can be completedly explained
单项选择题
If the space animal theory is true, the creatures go down to the lower regions in order to ______.
A．escape detection
B．arouse curiosity
C．search for man-made energy
D．make contact with man
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