单项选择题

According to the passage, what is the meaning of the phrase "ups and downs" in the fifth sentence of paragraph two

A．Good and bad experiences.
B．The movement of going up and down.
C．Conflicts.
D．Happiness.
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单项选择题
What is the difference between Gerald and Birkin
A．Gerald establishes the inhuman mechanical system in his mining kingdom.
B．Birkin thinks highly of human warmth.
C．Gerald is a physically live but spiritually dead man.
D．All of the above are right.
单项选择题
We can tell the difference between a glacier and a mere mass of ice by ________.
A．the thickness of the ice
B．the movement of the ice
C．the weight of the ice
D．the amount of ice
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