单项选择题

The _______ crown jewels are kept in the Tower of London.

A．valued
B．valueless
C．invaluable
D．worthy
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单项选择题
Primary batteries or cells are _______ , once discharged, are discarded.
A．those
B．those that
C．that
D．that they
单项选择题
_______ its weights is the Earth's gravitational attraction for the particular mass..
A．When it gives matter
B．Matter is given
C．What gives matter
D．How it is given matter.
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