The ______ discovered many rare plants.
（A）ecologist
（B）zoologist
（C）biologist
（D）botanist
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- 1The little ______ was caught by the wolf.
- 2_________ in drinking water have spread the illness.
- 3He gave us a good ______ of his experience.
- 4The hunter watched for the _______ to come out of the burrow.
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