【多选题】循环经济主要有三大原则,简称“3R”原则,每一个原则对循环经济的成功实施都是必不可少的。下列选项中属于原则的有()。
【单选题】Students are warned of the consequences of falling behind because if they do ______ .
A.
they will have to leave college
B.
they will never be able to catch up
C.
they will have to work much harder afterwards
D.
their term papers will not be accepted
【单选题】Students are warned ________ in the exam, otherwise they will be severely punished.
【单选题】SpeakerA: Do you often go to the movies? SpeakerB :_____________________
A.
They often go to the movies on weekends.
B.
I don't go to the movies.
C.
No, but I often go dancing.
【单选题】The students are warned not to talk about anything ______ to the accident that happened the other day in the school.
【单选题】下列分子中,C与O之间键长最短的是( )。