单项选择题

Through efforts by several environmental societies, the American buffalo is no longer in danger of becoming an______ species.

A．offensive
B．extinct
C．distinct
D．withered
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单项选择题
In some countries, attendance in the public schools is______ until age sixteen.
A．complimentary
B．compulsory
C．complementary
D．customary
单项选择题
Knowing that the slightest mistake meant losing his job, the waiter carried the expensive glasses______ from the kitchen.
A．cautiously
B．gravely
C．profoundly
D．radically
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