题目

The driver can adjust the heating in winter and the air conditioning in summer to suit his own _____.A. leisure     B. preference     C. convenience     D. selection   答案：Bpreference偏爱，更加喜欢：My preference is for beef rather than for lamb.(我更喜欢牛肉面不是羊肉。)  先化简，再求值：x（x+1）﹣（x+1）（x﹣1），其中x=2018．