问题补充：
These plants are watered.
A. each other day
B. every other day
C. each of two days
D. every of two days
答案：
A. each other day
(答案→)B. every other day
C. each of two days
D. every of two days
解析：考查固定用法。every other day 每隔一天。其它选项结构不对，故选B，这些指物每隔一天浇一次。
