题干

观察下列模型并结合有关信息,判断有关说法不正确的是(   ) 
 
B12结构单元
SF6分子
S8分子
HCN
结构模型示意图




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A:单质B12属原子晶体,结构单元中含有30个B-B键,含20个正三角形

B:SF6是由极性键构成的非极性分子

C:固态硫S8属于原子晶体

D:HCN的结构式为H-C≡N

上一题 下一题 0.0难度 选择题 更新时间:2018-06-19 09:53:03

答案(点此获取答案解析)

C

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    Rob Frenette had problems with bullies(欺辱) at school for eleven years. He was often lonely and scared. When he was fifteen, however, he decided to do something about his problems. He walked into a newspaper office and told them about the bullying. His story went into the newspaper and soon all the TV stations in Canada wanted to talk to him about his experiences. They also wanted to hear his ideas to stop bullying.

    After that, Rob continued his studies at school, but in his free time he helped other people with bullying problems. With a friend Katie Neu, he made a website called www. bullyingcanada. ca. Visitors to the website can find advice, stories and poems about bullying, in both English and French. When people are upset, they can talk on the phone or online to Rob and his team. Every weekend Rob has to answer e-mails to the website. He also speaks to children, teachers and members of government around the country about bullying.

    Rob's most important message is: “When bullies are unkind to you, it isn't your fault (过错、责任). There's nothing wrong with you, so you should try to keep trusting yourself. And remember that people care about your problems. You just have to find those people.”

    One of Rob's ideas is “Blue Day”, a special day for stopping bullying in schools. Students have to wear blue clothes and in class they learn how to stop bullying. More than 150 Canadian schools now celebrate Blue Day, but Rob won't stop until there's a Blue Day in every school in Canada.