单项选择题

Enamel, the hardest substance in a human being’s body, covers the entire crown of the tooth.

A．whole
B．inseparable
C．superficial
D．main
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单项选择题
The five classic foot positions in ballet are the basis for the ethereal grace of the ballet dancer’s art.
A．balanced
B．traditional
C．disciplined
D．delicate
单项选择题
Molly Brown was labeled “unsinkable” after she helped to evacuate passengers from the ill-fated ship the Titanic.
A．anticipate
B．comfort
C．remove
D．shelter
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