单项选择题

The car comes with a heater but the air conditioning is __________.

A．excessive
B．additional
C．optional
D．arbitrary
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单项选择题
Bachelor's degree graduates get an average of four or five job offers with salaries __________ from the high teens to the low 20s and plenty of chances for rapid advancement.
A．altering
B．ranging
C．differing
D．separating
单项选择题
The doctors have tried very hard rescuing from the vital brain damage, but all their efforts went __________.
A．in vain
B．in no way
C．without effect
D．without fail
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