单选题
According to the passage, what is the effect of Jupiter's other large moons on Europa?
A、
( They prevent Europa's subsurface waters from freezing
B、
( They prevent tides that could damage Europa's surface
C、
( They produce the very hard layer of ice that characterizes Europa
D、
( They assure that the gravitational pull on Europa is maintained ar a steady level
【正确答案】
A
【答案解析】
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