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
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 |
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 |