____________ during long land or sea voyages was an enormous challenge. 使植物在陆地上或海上远距离航行时存活下来是一个巨大的挑战。(动词-ing形式作主语)

　　4.

　　So pollination takes place, therefore ____________ of the survival of the plant species. 这样通过授粉，就增加了植物物种生存的机会。(动词-ing形式作结果状语) Key:1. bringing back plants　2. known as　3. Keeping plants alive 4. increasing the chances

　　课文回顾 Key:1. their　2. is rewarded　3. attached　4. and　5. increasing　6. depends 7. as　8. butterflies　9. with　10. to guide

　　　 阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。 Over time, many flowering plants and __1__ (they) animal pollinators

　　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 pattern __10__ (guide) the bees to the nectar inside.

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