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阅读下面材料,在空白处填入适当的内容或括号内单词的正确形式。

Over time, many flowering plants and 1. (they) animal pollinators(传粉昆虫) have evolved together. The plant needs the animal to pollinate it and the animal 2. (reward) with food called nectar when it visits the flowers. Pollen becomes 3. (attach) to the animal during its visit to a flower 4. is then passed on to another plant’s blossom on its next visit. So pollination takes place, therefore 5. (increase) the chances of the survival of the plant species.

The type of pollinator 6. (depend) on the characteristics of the flower such 7. its colour, shape, size and smell. For example, yellow flowers attract bees, while red flowers attract 8. (butterfly). The nectar in some flowers can only be reached by a bird 9. a long bill or a long-tongued moth or butterfly. Flowers that attract bees often have a special way 10. (guide) the bees to the nectar inside.

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