To be sure, some insects can build complex societies ______ (由不同类别的昆虫所组成) performing different tasks.

A. warm B. hot C. heated D. cool

A. mobile office is the only way by which people could enjoy prompt and safe working environment
B. with the development of science, mobile office comes to our life inevitably
C. people had no convenient and reliable communications and office faculty before
D. mobile interconnection platform and its application systems is the core of mobile office