问题
选择题
—What does the sigh 
mean?
—It means "_____". [ ]
A. Plant trees
B. Be careful
C. Save water
D. Take care of the earth
答案
答案：C
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—What does the sigh mean?
—It means "_____". [ ]
A. Plant trees
B. Be careful
C. Save water
D. Take care of the earth
答案：C