单项选择题
The statement about the mad cow disease constituted a direct （）to the British government.
A.instructionB.permissionC.challengeD.sympathy
单项选择题 She wrote articles and （）to the Evening Paper.
单项选择题 （）to speak at the meeting，I couldn’t very well refuse.
单项选择题 It （）that the necklace was made of glass.
