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单项选择题

We haven't the ______ idea why we got such a massive telephone bill last month.

A．dampest
B．mistiest
C．foggiest
D．rainiest

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单项选择题According to the professor, what characteristic of Earth’s moon should a theory of its origin be able to explain

A．The Moon has no water.
B．The Moon contains almost no iron.
C．Thy Moon is the largest moon in the solar system.
D．The Moon does not have a molten core.

单项选择题Why is the second theory sometimes referred to as the Mars Theory

A．Earth’s moon used to orbit Mars.
B．Mars was captured by the gravitational field of the Sun.
C．A planet the size of Mars collided with Earth.
D．Mars is larger than Earth.