单项选择题

A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
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单项选择题
A．The class size is smaller.B．It may offer the class he needs during the day.C．Its courses cost less.D．It has a pool.
A．The class size is smaller.
B．It may offer the class he needs during the day.
C．Its courses cost less.
D．It has a pool.
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