【C18】A．answerB．oppositeC．alternativeD．other

【C18】A．answerB．expressionC．reasonD．effect

【C2】A．contraryB．oppositeC．acrossD．further

【C20】A．answerB．methodC．solutionD．approach

A．selectionB．optionC．alternativeD．substitute

【C18】A．backwardB．oppositeC．otherD．round

【C7】A．answerB．requestC．questionD．difficulty