题目内容
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
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 |
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 |