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    精英家教网 > 高中英语 > 题目详情

    The flowers______sweet in the botanic garden attract the visitors to the beauty of nature.

    A.to smell             B.smelling             C.smelt          D.to be smelt

    B


    解析:

    本题考查非谓语动词。所填的应当是作the flowers 的定语。smell 为连系动词，没有被动语态。to smell 表示将要，不合题意。smelling 表示与所修饰的词为主谓关系。

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    Color use in nature

    Nature is very colorful, full of different hues（色调）that delight the eye. What makes these colors and why do they exist?

    Causes of Colors in Nature

    Colors in nature are formed in two ways. Pigments, like the melanin in skin and many animal furs, produce most blacks, browns, reds and yellows. Most plants are green due to chlorophyll（叶绿素）. Other colors are caused by structure, like many greens, blues, and whites. Blue bird’s feathers actually contain black pigment, but their structure causes them to appear blue. The scattering of light by tiny dust particles in the air, viewed against the black background of space, makes the sky look blue too.

    Color Use in Plants

    Color has a great effect on the survival of plants and animals. Flowers have bright hues and patterns to attract insects. These insects move from one flower to another, making sure seeds are produced. Bees can see colors we cannot, i.e. ultraviolet, and follow these patterns of stripes or dots to the inside of the flower.  

    Not only flowers but also fruits use color for the good of the plant. An unripe fruit mixes in with the leaves, but ripe berries contrast, becoming more appealing to the creatures who eat them. Birds are especially drawn to red fruit, and in turn help the plant by broadcasting its seeds.

    Camouflage（伪装）in Nature

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    Some animals even change colors to better camouflage themselves, seasonally like the snowshoe hare.

    Warning Coloration and Mimicry（动态伪装）

    Warning colors make an animal more visible rather than hidden. These usually indicate a negative aspect of the animal, like the bad taste of a monarch butterfly, smelly smell or painful bite of a bee. Usually black and a contrasting color (white, yellow, orange or red) form a striking pattern in these creatures, and frighten their enemies away. Nature is tricky, though, and sometimes harmless creatures pretend the patterns of harmful ones to scare off animals living on meat too.  

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