Which alerts will be seen on the console when running the command： logging console warnings.（） A: warnings only B: warnings， notifications， error， debugging， informational C: warnings， errors， critical， alerts， emergencies D: notifications， warnings， errors E: warnings， errors， critical， alerts

降低学习效率的行为有哪些？ A: listening to music B: passively rereading （被动重复） C: cramming D: turn off phone notifications（关掉手机推送消息）

Smart phones usually make people get distracted and lose focus of what isimportant in front of them because of the following things EXCEPT . A: social media feeds B: a wake-up call C: games, videos and music D: social notifications