问一道03/10的阅读题

kinki_yyUID: 2131963

8、According to the passage,what is the effect of Jupiter's other large moons on Europa?
A)The 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 at a steady level.

文中定位："The interior of Europa has been kept warm over the eons by tidal forces generated by the varying
                     gravitational tugs of the other big moons as they wheel around Jupiter.The tides on Europa pull and
                      relax in an endless cycle. The resulting internal heat keeps what would otherwise be  ice melted
                      almost to the surface."
答案是A，我选的是B。我查过了寄托的阅读笔记，上面说因为"keep warm"和"internal heat“所以才"prevent
Europa's subsurface waters from freezing”。可是我还不是很理解，定位的这段话也不是很理解，请高人指点文中哪里可以推出防止表面以下的水结冰。

hypocricyUID: 2165571

me too

qq620UID: 2167239

The resulting internal heat keeps what would otherwise be  ice melted almost to the surface这不是答案的所在吗