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    There are purple clothes, purple handbags, purple bicycles, purple furniture, even purple computers! So purple is one of the most______colors today. But in the past, purple was a very expensive and unusual color. Let’s take a look at the rich______of the color purple.

    Some scientists believe that the first plants to appear on Earth over 500 million years ago______looked purple, not green. Plants today are green because______use green chlorophyll (叶绿素) to produce energy.______these early plants probably used something called retinal, which is a dark purple color.

    During the time of the roman Empire (37 BC-476 AD), it was very______to make purple dye (染料). The dye came from sea snails (海螺) .But10.000 dead sea snails______you just one gram (克)of purple dye… as well as a very bad smell! This______purple dye was called Tyrian purple, and it was the preferred______of emperors.

    In 16th--century England, purple was______for the kings family members. Queen Elizabeth Is clothes were purple, but ordinary people were not allowed to______the color.

    In 1856. William Perkin, an 18-year-old______student, noticed something strange while doing an experiment (实验). The chemicals (化学药品) he used to clean his instruments______with the chemicals he used in his experiment and produced a bright purple color. This______Perkin to start a company using this chemical mixture to make purple dye. The dye was much______than sea snail dye. Thanks to Perkin, now anyone can afford to wear purple clothes.

    1.A. peaceful B. popular C. exciting D. serious

    2.A. history B. style C. research D. product

    3.A. gradually B. especially C. exactly D. probably

    4.A. others B. they C. we D. some

    5.A. And B. So C. But D. Until

    6.A. dangerous B. common C. difficult D. strange

    7.A. got B. passed C. wasted D. cost

    8.A. basic B. harmful C. special D. perfect

    9.A. color B. smell C. plant D. animal

    10.A. even B. never C. seldom D. only

    11.A. wear B. sell C. change D. make

    12.A. geography B. science C. art D. math

    13.A. compared B. mixed C. collected D. kept

    14.A. survey B. suggestion C. discovery D. exam

    15.A. healthier B. thicker C. cheaper D. darker

    1.B 2.A 3.D 4.B 5.C 6.C 7.A 8.C 9.A 10.D 11.A 12.B 13.B 14.C 15.C 【解析】试题这篇说明文通过对比和举例，介绍了紫色的来历和发展，说明紫色曾经是是一种非常昂贵和不寻常的颜色，但在科学家Perkin的努力下，用两种化学混合物制造紫色染料，终于使紫色...
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