单项选择题

The United States and Canada have agreed ________in regard to the Great Lakes.

A．to eliminate swimming entirely
B．to limit boating and fishing
C．to limit phosphates and detergents
D．to kill all algae
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单项选择题
Which of the following statements about the symbols is INCORRECT
A．Both are used as the organization’’s official symbols.
B．Both are used regardless of religious significance.
C．The red cross was the organization’’s original symbol.
D．The red crescent was later adopted for use in certain regions.
单项选择题
Allen is buying the tickets________.
A．because she gets a student discount
B．because Bob doesn’’t have very much money
C．because she lost a bet and owes Bob money
D．because Bob left his wallet at home
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