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  3. For the relatively few dominant tree species that make up temperate forests, where there are many individuals of the same specie

For the relatively few dominant tree species that make up temperate forests, where there are many individuals of the same specie

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问题     For the relatively few dominant tree species that make up temperate forests, where there are many individuals of the same species within pollen range, this is quite a safe gamble. [A] By contrast, in the tropics, where each tree species has few, widely scattered individuals, the chance of wind blowing pollen to another individual is sufficiently slim that animals are a safer bet as transporters of pollen. [B] Even tall trees in the tropics are usually not wind-pollinated despite being in windy conditions. [C] In a similar way, trees in temperate forests that are insect-pollinated tend to grow as solitary, widely spread individuals. [D]
    Look at the four squares [■] that indicate where the following sentence could be added to the passage. If a number of people in the village were throwing letters off roofs, your friend would be bound to get one.
    Where would the sentence best fit?
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答案A
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