Americans ensure proper respect for the national flag by
A. making laws.
B. enforcing discipline.
C. educating the public.
D. holding ceremonies.
正确答案是（）
A. unusual
B. particular
C. unique
D. typical
What is the disappointment many students have to face in finishing their paper？
Almost every professor forced them to buy textbooks by themselves.
B. The books or journals they are searching for are destroyed by the flood.
C. They are too busy fighting against the flood to finish their paper.
D. Their papers are greatly damaged by the unexpected flood.
正确答案是（）
A. distinguishing
B. discovering
C. determining
D. detecting
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