题目内容
1.Russia has the biggest ____ (人口)in Europe.
2.I’ll go there according to the weather________ (条件；状况)
3.Each student should learn to ____ (保护)the wild animals.
4.She was very anxious to get away from cities and back to ____ (自然).
5.The ____ (政府)is making laws against water pollution.
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