单项选择题

A．Dry lake beds.
B．Dry river channels.
C．Places which thermal systems.
D．Parks and gardens.
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单项选择题
What is the best rifle of the passage
A．The perils of prosperity
B．Fruits of affluence
C．Growth and its social effects
D．Prosperity and environment
单项选择题
A．Scientists from Mars Underground want to stay on Mars for a lifetime.B．Scientists from Mars Underground have been paying attention to the manned missions that we have been sending to Mars.C．Even if there is any life on Mars, it is not an intelligent one.D．We will send astronauts to Mars within ten years.
A．Scientists from "Mars Underground" want to stay on Mars for a lifetime.
B．Scientists from "Mars Underground" have been paying attention to the manned missions that we have been sending to Mars.
C．Even if there is any life on Mars, it is not an intelligent one.
D．We will send astronauts to Mars within ten years.
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