单项选择题

Stock farmers must be ______ to the possible reoccurrence of foot-and-mouth disease that has already killed millions of pigs and cows in East Asia.

A．observable
B．apparent
C．alert
D．marked
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单项选择题
Please be ______ and refrain from answering your mobile phone when someone else is speaking to you.
A．considered
B．consideration
C．considerate
D．consider
单项选择题
At least five years working experience in the field is required to be eligible ______ the sales manager position.
A．to
B．with
C．for
D．of
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