单项选择题

Dr. Clark will be attending the annual meeting to share his views on various ______ issues.

A．environmentalist
B．environmentalism
C．environmental
D．environmentally
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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
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
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