题目

Circus tigers, although they have been tamed, can _____ attack their trainer.         A. unexpectedly    B. deliberately    C. reluctantly     D. subsequently 答案：A 解析: unexpectedly 出乎意料地。例如：He unexpectedly failed to get the job.(他出乎意料没有得到这件工作。)又如：We met each other unexpectedly. (我们不期而遇。)deliberately故意地：I believe the house was deliberately set fire to.(我相信这房子是有人故意放火烧的。)reluctantly 不情愿地，勉强地：She agreed, very reluctantly, to help. (2．在平面直角坐标系xOy中，已知直线l：y=x，作A1（1，0）关于y=x的对称点B1，将点B1向右水平平移2个单位得到点A2；再作A2关于y=x的对称点B2，将点B2向右水平平移2个单位得到点A3；…．请继续操作并探究：点A3的坐标是（3，2），点B2015的坐标是（2014，2015）．