同学们正处于青春期，下列关于青春期说法正确的是（    ）

酵母菌的呼吸作用方式可以用以下两个反应式来表示：

有氧呼吸：C₆H₁₂O₆+6O₂ 6CO₂+6H₂O+能量

无氧呼吸：C₆H₁₂O₆ 2C₂H₅OH+2CO₂+能量

某兴趣小组成员为了探究酵母菌在呼吸作用过程中气体体积的变化（已知相同条件下，分子数相同的任何气体，体积相同），进行了实验．在装有酵母菌和足量葡萄糖溶液的气球中通入O₂和CO₂直到饱和，再注入一定量的氧气，扎紧后放入装有温水的量筒中（如图所示），记下液面的读数，以后每隔一段时间进行观察并记录量筒中液面的读数．请回答下列问题：

    There are purple clothes, purple handbags, purple bicycles, purple furniture, even purple computers! So purple is one of the most1colors today. But in the past, purple was a very expensive and unusual color. Let's take a look at the rich2of the color purple.

    Some scientists believe that the first plants to appear on Earth over 500 million years ago3looked purple, not green. Plants today are green because4use green chlorophyll (叶绿素) to produce energy.5these 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 very6to make purple dye (染料). The dye came from sea snails (海螺) .But10.000 dead sea snails7you just one gram (克)of purple dye… as well as a very bad smell! This8purple dye was called Tyrian purple, and it was the preferred9of emperors.

    In 16th--century England, purple was10for the king's family members. Queen Elizabeth Is clothes were purple, but ordinary people were not allowed to11the color.

    In 1856. William Perkin, an 18-year-old12student, noticed something strange while doing an experiment (实验). The chemicals (化学药品) he used to clean his instruments13with the chemicals he used in his experiment and produced a bright purple color. This14Perkin to start a company using this chemical mixture to make purple dye. The dye was much15than sea snail dye. Thanks to Perkin, now anyone can afford to wear purple clothes.