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【单选题】
对于室温下的单原子分子理想气体，在等压膨胀的情况下，系统对外所作的功与从外界吸收的热量之比等于()A.
2/5
B.
2/7
C.
2/3
D.
1/2
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举一反三
【单选题】When the teacher came into the classroom, all of us __________ the classroom.
A.
are cleaning
B.
were cleaning
C.
cleaned D are cleaned
【单选题】听力原文： World Environment Day was established by the United Nations General Assembly in 1972 to mark the opening of the Stockholm Conference on the Human Environment. World Environment Day can be celebr...
A.
In 1992.
B.
In 2000.
C.
In 2004.
D.
In 1972.
【单选题】There isn’t a teacher in the classroom and all the students are talking. So the classroom is ________.
A.
quiet
B.
strict
C.
noisy
【单选题】There is a blackboard _______ the classroom and another one _______ the classroom.of [ ]
A.
in the front of, at the back of
B.
in the front of, at back of
C.
in front of, at the back of
D.
in front of, at back
【单选题】When the teacher came into the classroom, she was not ________ because the classroom was not as ________ as ________. [ ]
A.
pleased; clean; usually
B.
angry; cleaning; usual
C.
pleased; clean; usual
D.
happy; clean; usually
【单选题】Their classroom is _____ than ours, that is to say, their classroom is as small as ours.
A.
much bigger
B.
much smaller
C.
no bigger
D.
less small
【单选题】According to the speaker Liu Yuhan, which one does she prefer, the traditional classroom or the online classroom?
A.
traditional classroom
B.
online classroom
【单选题】听力原文： World Environment Day was established by the United Nations General Assembly in 1972 to mark the opening of the Stockholm Conference on the Human Environment. World Environment Day can be celebr...
A.
In 1992.
B.
In 2000.
C.
In 2004.
D.
In 1972.
【单选题】听力原文： We hear it a lot in the news these days: 'Recycle newspapers and save a tree. Collect bottles and calls so they can be reused in the manufacturing of new products.' Protecting our delicate envir...
A.
Important Keys to Recycling Paper.
B.
Technological Advances Improve Recycling.
C.
Steps to Improve Recycling.
D.
A Greater Demand for Improving Recycling.
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