【单选题】We should _____ the power when our TV or computer is not used.
【判断题】在股票风险中,通过投资组合,能够消除的部分称为可分散风险,而不能被消除的部分则称为市场风险。如果组合中股票数量足够多,则任意单只股票的可分散风险都能够被消除。( )
【单选题】Please ______ the computer. We will have the Computer Studies.
【单选题】______leaves the room last should turn off the lights.
【判断题】We should turn off our cell phone when we attend trade shows
【单选题】We should save energy, such as ______ the lights before leaving the classroom. [ ]
【单选题】We should make____a rule for us that the last to leave the classroom shall turn the light off.
【单选题】______leaves the room last should turn off the lights.