【单选题】【消耗次数：1】
评价石灰质量的最主要的指标是
①
活性氧化钙和氧化镁含量
②
细度
③
二氧化碳含量
④
体积安定性
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相关题目
【单选题】
二氧化碳被称为温室气体，是因为二氧化碳能（）。
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A.吸收太阳辐射，使人体增温
②
B.破坏臭氧，使到达地面的紫外线增多
③
C.强烈地吸收地面放出的长波辐射
④
D.通过光化学反应向大气中释放热能
【单选题】
空气中的二氧化碳仅占空气体积总量的（）。
①
A.0.01%－0.02%
②
B.0.03%－0.04%
③
C.0.05%－0.06%
④
D.0.07%－0.08%
【判断题】
二氧化碳灭火器是利用其内部充装的液态二氧化碳的蒸气压将二氧化碳喷出灭火的一种灭火器具，其通过降低氧气含量，造成燃烧区窒息而灭火，一般能造成燃烧中止的氧气含量应低于12%。
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正确
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Which of the following is the advantage of whole class work?
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It is an ideal way to show materials and do presentations together
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It allows students to work together rather than under teacher’s guidance.
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There is always a great chance of different opinions and contributions to the work
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It is less stressful.
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Which of the following is the time when students work in groups?
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When all the students are under the control of the teacher
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When students work in pairs on an exercise or a task
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What are the possible roles of a teacher?
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Controller, assessor
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Organizer, prompter
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Participant, resource-provider
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When all the students are under the control of the teacher
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Controller
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Why do novice teacher often have problems giving clear instructions?
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Their language proficiency is low
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They are fresh from the university
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Their instructions are too short
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Give directions to tasks or activities, checking comprehension, giving feedback
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Setting requirements, checking comprehension, assigning homework
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Use simple instructions and make them suit the comprehension level of the students
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