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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