题目

 It was their old car             my friend and his father sold to a Mexican last week. A. when                B. which               C. whether            D. that 答案：D浙江省山地丘陵广布，适宜茶树的生长，但春季易受霜冻天气影响．为此，当地茶园引进了“防霜冻风扇”（如图1）．当夜晚温度降到4cc时，风扇会自动打开，从而减轻霜冻对茶树的伤害．图2为“茶园某时气温垂直分布示意图”，据此回答8～9题．