第33题: [单项选择]If you plant two apple trees in one square yard of land, and the trees' productivity ______ decline. A. is bound to B. is determined to C. is unlikely to D. is related to 参考答案:A 答案解析:be bound to一定会;be determined to下定决心做某事;be unlikely to不大可能,与句子意思不符;be related to与……相关。