题干

烫发时,先用还原剂使头发角蛋白的二硫键断裂,再用卷发器将头发固定形状,最后用氧化剂使角蛋白在新的位置形成二硫键。这一过程改变了角蛋白的(   )

A:空间结构

B:氨基酸种类

C:氨基酸数目

D:氨基酸排列顺序

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答案(点此获取答案解析)

A

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    The First Robotics Competition (FRC) was held in Shenzhen. A total of 35 high-school student teams from China, the United Kingdom, Turkey, Poland and other countries joined the two-day contest with their hand-crafted robots.

    The FRC is a world-class robotics competition that was first launched in the United States in 1989. It encourages students to improve their hands-on skills and creative capabilities.

    There are strict rules, limited resources and an intense six-week time limit before the competition. Teams of student should raise money, design a team brand and improve their teamwork skills, as well as build industrial-size robots to compete. The rules of the game include two groups, and each group has three teams. The group with the highest score wins the game.

    The seven teams who won the top prizes in the FRC  Shenzhen Regional will take part in the First Championship to be held in the United States next month.

    Yin Shifei, secretary general, said the competition not only enables students to improve their programming, decision-making and problem-solving skills, but also encourages them to cooperate and share with other people

    According to Yin, a Shenzhen team invited over 40 left-behind children to the city to watch the FRC game because they wanted to make education more equitable. And the left-behind children can get fair education. These children's parents are migrant workers in Shenzhen, but they are left behind i their hometowns.

    Shenzhen became the first city to host an FRC region in Asia last year, and another regional contest will be held in Shanghai this year.