The _______ brought out a specimen box and showed the items one by one.
（A）ecologist
（B）zoologist
（C）biologist
（D）botanist
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- 1Nobody knows why ______ are disappearing, dolphins are dying and coral is turning white.
- 2I’m worried about the appearance of the floor.I need to _____ it.
- 3A contemporary _______ once said: man lives on the earth as a guest of green plants.
- 4_________ which eat crops are pests.
- 5_________ in drinking water have spread the illness.
- 6A general _______ is held in the United States every four years.
