第21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。
第22题: [单项选择]肾精亏耗型眩晕的主症是 A. 眩晕神疲健忘 B. 眩晕劳倦易发或加重 C. 头胀而眩晕,烦恼加剧 D. 头部外伤后,眩晕而刺痛 E. 眩晕久治不愈,眠差健忘 参考答案:A