单项选择题
（）exchanges are an important part of cultural exchanges between twocountries.
A.previousB.uneasyC.academicD.divine
单项选择题 Investigators have not yet （）the cause of the air crash.
单项选择题 The film was （）praised by critics.
单项选择题 The statement about the mad cow disease constituted a direct （）to the British government.
