单项选择题

All matter is made up of atoms; _______, it is made up of nuclei with electrons whirling around them.

A．that is
B．on the contrary
C．in short
D．on the other hand
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单项选择题
Diamonds have little _______ value and their price depends almost entirely on their scarcity.
A．intrinsic
B．eternal
C．subtle
D．inherent
单项选择题
Most nurses are women, but in the higher ranks of the medical profession women are in a _______.
A．scarcity
B．minority
C．minimum
D．shortage
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