问题
选择题
— Do you have any plan for this summer vacation, Mary?
— Sure, I’ d like to be a volunteer and help to ______ the Central Park.
A．put up
B．call up
C．clean up
D．cheer up
答案
C
考查词组。put up 张贴，举起：call up 打电话；clean up 清理，cheer up 使兴奋；这里句意：我想成为一名志愿者帮助清理中心公园。