单项选择题

Since Ms. Evans ______ her disappointment regarding the service, the store manager has been careful to keep his eyes on the staff"s behavior.

A．shows
B．is showing
C．will be showing
D．showed
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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
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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