甘蔗是海南特产之一，其营养价值很高，含糖量极为丰富，其中的蔗糖化学式为：C₁₂H₂₂O₁₁．请计算：（本题只填结果，不写过程 ）

（1）每个蔗糖分子中含______个原子．

（2）蔗糖中C、H、O元素的质量比为______．

You had 8 people In your project，one more person will be joining next week．You know that once the new person joins，the number of communication channels will increase by______．

A．No change in number of communication channels

B．8

C．12

D．20