用单词或短语替换划线部分的词或短语。 (共6题；每小题1分，满分6分) 

注意：一格不限一词

小题1:To tell the truth, a lot of people want to be rich and famous.   _______________

小题2:The endangered animals he mentioned in his lecture may become extinct any time.

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小题3:They completely changed the design. You have no choice but to follow the new one.

________________

小题4:Anyhow, my goal is to supply humans with a life of high quality.

_______________

小题5:Their performances were humorous enough to be followed by other groups. __________________

小题6:It’s a great duty but also a great honor to be chosen as a volunteer for the World Expo.

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已知C₃N₄晶体具有比金刚石还大的硬度，且构成该晶体的微粒间只以单键结合。下列关于C₃N₄晶体的说法错误的是    (　　)

A．该晶体属于原子晶体，其化学键比金刚石中的化学键更牢固

B．该晶体中每个碳原子连接4个氮原子，每个氮原子连接3个碳原子

C．该晶体中碳原子和氮原子的最外层都满足8电子结构

D．该晶体与金刚石相似，都是原子间以非极性键形成空间网状结构