问题
选择题
On the 40th Earth Day, Dr Wang gave us a talk on the importance of ______ the earth. [ ]
A. practicing
B. preventing
C. polluting
D. protecting
答案
答案：D
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On the 40th Earth Day, Dr Wang gave us a talk on the importance of ______ the earth. [ ]
A. practicing
B. preventing
C. polluting
D. protecting
答案：D